For Multi-path Interference we have a term and definition in Car Stereo.

Multi-path interference affects FM radio reception. FM waves travel in a straight line, so anything between you and the FM transmitter can cause multi-path interference. When FM signals bounce off buildings and other large objects , the tuner picks up the same signal more than once, at different times. This create "echoes" that confuse the tuner by mixing with the original signal.
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