I used to live very close to Detroit Metro Airport and I would see strange signal issues often. Jumps from 100% down to 60's would cause a momentary breakup in the signal and it would shoot back up to 100%. Some days it was non-existent and some days it was really bad which probably depends on the path of the airplanes.
It was less noticeable on my VHF stations WJBK and CBET.
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