Weak reception (fading)
Because of the limited range of the FM senders and the fact that these waves are very reflective, this
problem usually occurs with FM reception. If the sender is blocked by buildings or mountains, static can
result.
Static
The reason why FM but not AM is audible is covered parking areas, under bridges, etc., is that FM
signals reflect against solid objects such as buildings. Because these waves are very reflective, static can
result. This static is the result of the reflected signal and the direct signal reaching your antenna at
slightly different times causing a cancellation of all signals. This problem occurs largely in built-up
areas.
pg. 1:42 Cross modulation, FM - reasons for distortion, AM - reasons for distortion
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