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possible answer
Rather than multipath, I would suggest that your problem could be co-channel.
If there is another channel with the same transmitter frequency as the one you are trying to receive getting into your receiver, it could wipe out the channel you are trying to receive. In my case, I was receiving a UHF Channel 23 just fine one minute and the next, it faded out. How did I know this was happening? I did an update scan for channels and I was also receiving another couple of "far away" channels from the same geographic general area. The channel I was trying to receive is 66 miles away and the unwanted one was hundreds of miles away. This seems to be more common in the summer months when there is a lot of moisture in the air and a phenomena called ducting takes place. Signals can travel for hundreds of miles beyond where they are supposed to be received. Also, signal level did not change much.
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