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Thread: Covering/coating a T.V. Antenna in what materials would most easily block a U.H.F./V.H.F. signal?

  1. #1 Covering/coating a T.V. Antenna in what materials would most easily block a U.H.F./V.H.F. signal? 
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    Please tell.


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    Forum Radioactive Isotope cosmictraveler's Avatar
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    Remove the antenna would be the best thing to do.


    When the power of love overcomes the love of power the world will know peace.
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  4. #3  
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    Quote Originally Posted by mcriv880 View Post
    Please tell.
    Grounded metal that is not touching the antenna itself.
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    Forum Radioactive Isotope sculptor's Avatar
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    mcriv#s

    Do you still want to receive certain wavelength signals while blocking uhf/vhf wavelengths?
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    lead container??
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    Quote Originally Posted by fiveworlds View Post
    lead container??
    He's trying to block RF, not nuclear radiation. Lead is a poor choice because of its resistivity.
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    Quote Originally Posted by mcriv880 View Post
    Please tell.
    Start with cosmictraveler's idea, supplemented by short-circuiting the antenna terminals with a short, wide (ribbon-like) piece of copper. Then add billvon's suggestion and wrap the tv inside a conductive covering.
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    Quote Originally Posted by tk421 View Post
    Quote Originally Posted by mcriv880 View Post
    Please tell.
    Start with cosmictraveler's idea, supplemented by short-circuiting the antenna terminals with a short, wide (ribbon-like) piece of copper. Then add billvon's suggestion and wrap the tv inside a conductive covering.
    And what would you use for the covering?
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    Quote Originally Posted by sculptor View Post
    mcriv#s Do you still want to receive certain wavelength signals while blocking uhf/vhf wavelengths?
    No
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  11. #10  
    Brassica oleracea Strange's Avatar
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    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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  12. #11  
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    Quote Originally Posted by mcriv880 View Post
    And what would you use for the covering?
    Copper foil with the seams soldered. (Long thin seams allow radiation in.)
    Last edited by billvon; January 16th, 2014 at 05:36 PM.
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  13. #12  
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    Quote Originally Posted by mcriv880 View Post
    Quote Originally Posted by sculptor View Post
    mcriv#s Do you still want to receive certain wavelength signals while blocking uhf/vhf wavelengths?
    No
    Then your easiest solution is to simply disconnect the antenna
    and/or just ground it
    or, better still
    take it down and recycle it
    tk421 likes this.
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  14. #13  
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    Quote Originally Posted by mcriv880 View Post
    Quote Originally Posted by sculptor View Post
    mcriv#s Do you still want to receive certain wavelength signals while blocking uhf/vhf wavelengths?
    No
    That rather begs the question of what you want the TV to do, then. If it's not going to be used to receive anything, then simply unplug it. Problem solved.
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    Well if not a non-conductive container like wood or lead which work for my phone when I dont want texts or calls you could use anti emf paints like these Electromagnetic Field Shielding Paints. The only thing about the wood or lead is there needs to be enough of it and sealed properly like my table drawers at home. I suppose you could paint the drawer as well. We could make an anti emf varnish or wood stain im not sure if that either exists yet.
    Last edited by fiveworlds; January 17th, 2014 at 10:28 AM.
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    Quote Originally Posted by fiveworlds View Post
    Well if not a non-conductive container like wood or lead which work for my phone when I dont want texts or calls
    1) Non conductive containers allow signals through.
    2) Lead is not non-conductive.
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  17. #16  
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    Not always and 2) true though neither is wood. Now me not being able to get signals in a container may be because i am in the middle of nowhere so the signal wasn't strong to begin with. I remember that a sheet of paper allows beta radiation through however over large distances it doesnt so obviously the results change dependant on distance from the source and the amount of paper. 1)What do you know of that has zero signal resistance thats a bad conductor?? You could try a bank vault thats most likely just cement and see if you get a signal i dont think you will.
    Last edited by fiveworlds; January 17th, 2014 at 11:13 AM.
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  18. #17  
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    Quote Originally Posted by fiveworlds View Post
    Not always and 2) true though neither is wood. Now me not being able to get signals in a container may be because i am in the middle of nowhere so the signal wasn't strong to begin with. I remember that a sheet of paper allows beta radiation through however over large distances it doesnt so obviously the results change dependant on distance from the source and the amount of paper. 1)What do you know of that has zero signal resistance thats a bad conductor?? You could try a bank vault thats most likely just cement and see if you get a signal i dont think you will.
    The right way to think about this is first to acknowledge that just about everything affects everything to some degree, so the important thing is not a binary question ("is there an effect?"), but rather the degree to which the effect manifests itself.

    Wood, paper and cement will attenuate RF to some degree, but the effect is weak compared to, say, copper or aluminum. Good conductors will have the strongest effect.

    Since the OP presumably wants a practical solution, suggesting that he encase his antenna in 10m-thick concrete is absurd.
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    Quote Originally Posted by fiveworlds View Post
    Not always and 2) true though neither is wood.
    Wood by itself is non-conductive. It is not normally used as an insulator because it is good at absorbing water, and water often contains ionic compounds (like salt.) And salt water IS conductive.

    1)What do you know of that has zero signal resistance thats a bad conductor?
    By definition things that have low resistance are good conductors.

    You could try a bank vault thats most likely just cement and see if you get a signal i dont think you will.
    I think you might be confusing conductive materials and lossy materials. There are several mechanisms by which EM signals are attenuated in nonconductive materials (change in permittivity, molecular resonance etc)
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    Quote Originally Posted by tk421 View Post

    Since the OP presumably wants a practical solution, suggesting that he encase his antenna in 10m-thick concrete is absurd.
    You get used to fiveworlds posting impractical, irrelevant or just plain wrong advice (with excessive confidence) most of us know just to ignore his crap.
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    Quote Originally Posted by PhDemon View Post
    Quote Originally Posted by tk421 View Post

    Since the OP presumably wants a practical solution, suggesting that he encase his antenna in 10m-thick concrete is absurd.
    You get used to fiveworlds posting impractical, irrelevant or just plain wrong advice (with excessive confidence) most of us know just to ignore his crap.
    He does seem to have a somewhat tenuous grasp of science, combined with a Dunning-Kruger confidence, 'tis true.
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  22. #21  
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    To answer the OP directly; Wrapping the antenna in aluminium foil would prevent it receiving any VHF, or UHF frequencies, but I cannot understand why you would want to do that, so obviously I have not understood the question.


    OB
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    Quote Originally Posted by One beer View Post
    To answer the OP directly; Wrapping the antenna in aluminium foil would prevent it receiving any VHF, or UHF frequencies, but I cannot understand why you would want to do that, so obviously I have not understood the question. OB
    Well no money I don't have any specific reason to mention right now. Iol. I was wondering what the best metal to use is.
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    Quote Originally Posted by Strange View Post


    Laughing!!!!!
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  25. #24  
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    I know that to increase you use aluminum, or we used too. Not scientific, I suppose, but it worked!
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  26. #25  
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    Quote Originally Posted by mcriv880 View Post
    Quote Originally Posted by One beer View Post
    To answer the OP directly; Wrapping the antenna in aluminium foil would prevent it receiving any VHF, or UHF frequencies, but I cannot understand why you would want to do that, so obviously I have not understood the question. OB
    Well no money I don't have any specific reason to mention right now. Iol. I was wondering what the best metal to use is.
    I am still finding this weird. Are you asking what the most conductive metal to use would be, or what is the easiest metal to use from a practical - wrapping an aerial up - point of view? I'm pretty sure the most conductive metal is silver, followed by copper. But if you were to climb onto someone's roof and wrap something around their aerial, I would have thought Aluminium foil would be easiest. But why do you want to do this ???? OB
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    Quote Originally Posted by One beer View Post
    Quote Originally Posted by mcriv880 View Post
    Quote Originally Posted by One beer View Post
    To answer the OP directly; Wrapping the antenna in aluminium foil would prevent it receiving any VHF, or UHF frequencies, but I cannot understand why you would want to do that, so obviously I have not understood the question. OB
    Well no money I don't have any specific reason to mention right now. Iol. I was wondering what the best metal to use is.
    I am still finding this weird. Are you asking what the most conductive metal to use would be, or what is the easiest metal to use from a practical - wrapping an aerial up - point of view? I'm pretty sure the most conductive metal is silver, followed by copper. But if you were to climb onto someone's roof and wrap something around their aerial, I would have thought Aluminium foil would be easiest. But why do you want to do this ???? OB
    We did it to increase reception.....and I did I here our first house before we had cable TV...three channels and thy only came in decently when I applied the aluminum to the odd little antenna we had to use. Felt like freaking newlywed again....and that was a LONG time ago.
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    You're asking a question that's answered in my question. To block out signals from being received by the antenna. In other words a coating that acts as a shield rather than improving reception.
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    Quote Originally Posted by mcriv880 View Post
    You're asking a question that's answered in my question. To block out signals from being received by the antenna. In other words a coating that acts as a shield rather than improving reception.
    Please, if you don't mind, reference who your response is to. It really does help prevent confusion!
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  30. #29  
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    Babe, are you talking about using aluminium foil wrapped around just the reflector part of the aerial to improve reception? I think the OP is talking about covering the whole aerial - including the active dipole element - to reduce or completely stop reception. Am I right? But please tell us mcriv880; why do you want to do this???
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    Quote Originally Posted by One beer View Post
    Babe, are you talking about using aluminium foil wrapped around just the reflector part of the aerial to improve reception? I think the OP is talking about covering the whole aerial - including the active dipole element - to reduce or completely stop reception. Am I right? But please tell us mcriv880; why do you want to do this???
    I on't know what they are called *L* but the little wires that go up from the unit. Always just called that the antenna! Sorry if I am confusing you OB!!! here have one more!! on me!
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  32. #31  
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    Thanks, I will ! OK, I think I am beginning to understand. In a previous career, I was a communications engineer with our national broadcaster, and to me the antenna is the aerial on a pole on top of the house - and it is made of aluminium rods set out in a linear array, with either a plate or grid of rods at the rear, which form a reflector. A cable is connected to part of the aerial near the reflector and goes down into the house to the TV receiver. I can understand that if the cable is not good quality, then wrapping the cable with foil might improve its performance. But wrapping foil around the aerial on the roof would block reception, not improve it. Am I on the right page now ?
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    Quote Originally Posted by One beer View Post
    Thanks, I will ! OK, I think I am beginning to understand. In a previous career, I was a communications engineer with our national broadcaster, and to me the antenna is the aerial on a pole on top of the house - and it is made of aluminium rods set out in a linear array, with either a plate or grid of rods at the rear, which form a reflector. A cable is connected to part of the aerial near the reflector and goes down into the house to the TV receiver. I can understand that if the cable is not good quality, then wrapping the cable with foil might improve its performance. But wrapping foil around the aerial on the roof would block reception, not improve it. Am I on the right page now ?
    I am so laughing, One Beer.....I am talking a little old TV antenna! *L*



    maybe this will clear it up!!

    CHEERS!
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  34. #33  
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    Ah, now I am beginning to understand. So which part of that set top antenna did you cover in foil?
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    Quote Originally Posted by One beer View Post
    Ah, now I am beginning to understand. So which part of that set top antenna did you cover in foil?
    The little devil wires *chuckle*.....it works!
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  36. #35  
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    OK, well with my engineer's hat on I don't understand how that works - foil wrapped around both wires should short the aerial out, result no signal. But it obviously did work for you, so that's cool ! :-)
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    Quote Originally Posted by One beer View Post
    OK, well with my engineer's hat on I don't understand how that works - foil wrapped around both wires should short the aerial out, result no signal. But it obviously did work for you, so that's cool ! :-)
    If the foil is insulated from the antenna and grounded it will shield the signal.

    If the foil conducts to the antenna and is not grounded, it just becomes part of the antenna.
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  38. #37  
    Cooking Something Good MacGyver1968's Avatar
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    It's much easier for us to help solve you problem if we know what exactly you're trying to accomplish and why. As others have said, if you don't want an antennae to receive, just unhook it or short it. Unless you trying to play a practical joke on someone, and mess with their antennae so they can't figure out why they aren't getting a signal.
    Fixin' shit that ain't broke.
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    Quote Originally Posted by MacGyver1968 View Post
    It's much easier for us to help solve you problem if we know what exactly you're trying to accomplish and why. As others have said, if you don't want an antennae to receive, just unhook it or short it. Unless you trying to play a practical joke on someone, and mess with their antennae so they can't figure out why they aren't getting a signal.
    Yeah, if he's just trying to prevent reception, the easiest method by far is to unplug the TV. Works really, really, really well over the entire spectrum.
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  40. #39  
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    Quote Originally Posted by One beer View Post
    OK, well with my engineer's hat on I don't understand how that works - foil wrapped around both wires should short the aerial out, result no signal. But it obviously did work for you, so that's cool ! :-)
    If it had not worked *laughing*I'd have had ZERO television for month and since I also had no furniture and no computer set up....yet....I'd have been ready to kill!! *laughing*

    It really DOES work! My dad taught me that! He was an airplane tech, studied engineering and could fix anything! I miss him a lot.
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    Quote Originally Posted by billvon View Post
    Quote Originally Posted by One beer View Post
    OK, well with my engineer's hat on I don't understand how that works - foil wrapped around both wires should short the aerial out, result no signal. But it obviously did work for you, so that's cool ! :-)
    If the foil is insulated from the antenna and grounded it will shield the signal.

    If the foil conducts to the antenna and is not grounded, it just becomes part of the antenna.
    Thanks!! Trust me it wasn't "grounded"
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  42. #41  
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    Quote Originally Posted by tk421 View Post
    Quote Originally Posted by MacGyver1968 View Post
    It's much easier for us to help solve you problem if we know what exactly you're trying to accomplish and why. As others have said, if you don't want an antennae to receive, just unhook it or short it. Unless you trying to play a practical joke on someone, and mess with their antennae so they can't figure out why they aren't getting a signal.
    Yeah, if he's just trying to prevent reception, the easiest method by far is to unplug the TV. Works really, really, really well over the entire spectrum.
    Oh heaven's! You made me spit out my water!! *L*.....if it was champagne, you'd be in big trouble!! *chuckle*
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  43. #42  
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    Quote Originally Posted by babe View Post
    Quote Originally Posted by tk421 View Post
    Quote Originally Posted by MacGyver1968 View Post
    It's much easier for us to help solve you problem if we know what exactly you're trying to accomplish and why. As others have said, if you don't want an antennae to receive, just unhook it or short it. Unless you trying to play a practical joke on someone, and mess with their antennae so they can't figure out why they aren't getting a signal.
    Yeah, if he's just trying to prevent reception, the easiest method by far is to unplug the TV. Works really, really, really well over the entire spectrum.
    Oh heaven's! You made me spit out my water!! *L*.....if it was champagne, you'd be in big trouble!! *chuckle*


    And I didn't even mention the equally effective Norwegian sledgehammer method!
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    Quote Originally Posted by tk421 View Post
    Quote Originally Posted by babe View Post
    Quote Originally Posted by tk421 View Post
    Quote Originally Posted by MacGyver1968 View Post
    It's much easier for us to help solve you problem if we know what exactly you're trying to accomplish and why. As others have said, if you don't want an antennae to receive, just unhook it or short it. Unless you trying to play a practical joke on someone, and mess with their antennae so they can't figure out why they aren't getting a signal.
    Yeah, if he's just trying to prevent reception, the easiest method by far is to unplug the TV. Works really, really, really well over the entire spectrum.
    Oh heaven's! You made me spit out my water!! *L*.....if it was champagne, you'd be in big trouble!! *chuckle*


    And I didn't even mention the equally effective Norwegian sledgehammer method!
    OH MY GOD!! YOU BRAT!! Norwegians have the patience of TURNIPS! ahahahah as I m married to one....I KNOW *L*...you BRAT!!! ahahahahahahha

    thanks for making my evening!.....my Norwegian is headed to the Mainland on Friday...till May......I have"Recovery time" *L*
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