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This graph shows what CH 41 (red arrow) looks like when I can't receive it.
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Yep, that severe notch is going to be due to multipath due to one of its several forms, which is always due to having a blocked signal path and having to rely instead on various reflections which may arrive at the antenna in either and additive or a subtractive manner. That one is "subtractive" in the middle of that channel's bandwidth. Move the antenna a couple of feet in any direction and the received signals will change.