Radio wave frequencies varies from 300 GMz to as small as 3 KHz. • Radio wave travel at the speed of light. • wave have different frequencies when in the earths atmosphere, long wave lengths cover a part of the earth constantly and reflect off the ionosphere and then travel around the world. • Shorter wavelengths bend very little and travel on a line of a sight meaning that if there are buildings etc. in the way then the signal could be badly effected.