1992 Volvo 240
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 distortion can result.
Distortion
The reason why FM but not AM is audible in covered parking ares, under bridges etc. is that FM signals reflect against solid objects such as buildings.
Because these waves are very reflective multipath distortion can result. This distortion is the result of the reflected signal and the direct signal reaching your antenna at slightly different time causing a cancellation of all signals. This problem occurs largely in
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