Thread: Which goes further am or fm waves

Well me and my friend were having a debate about the distance am and fm radio waves travel I say Fm travels further and am doesn't travel as far he said the exact opposite so can anyone reveal the answer?

The AM frequency band has a longer wavelength and skips off the ionosphere especially at night. Therefore it potentially has a longer range.
http://www.cybercollege.com/frtv/frtv017.htm

Also, AM waves can curve along the ground by following the Earth's surface, which is slightly conductive. That's called surface wave propagation.

FM waves just go in a straight line, and get absorbed by the atmosphere or fly off into space.