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1 E layer: The next layer beyond the D layer is called the E layer. 2  This exists at an altitude of between 100 and 125 km. 3  Instead of acting chiefly as an attenuator, this layer reflects radio signals although they still undergo some attenuation.
Re: AM radio waves bounce off the ionospher, what do FM radio waves bounce off. Radio waves are the same thing as light waves. But the wavelength of radio waves is much longer. An AM radio wave has a wavelength in the range from 13 to 60 metres (shortwave) or around 200 to 500 metres (broadcast band).