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WPTZ and WVNY both have co-channel interference which is probably why reception is poor. That said, WCAX is actually on RF-22 presently (switching to RF-20 after the repack) and yet you claim to receive it well, even though it has co-channel with CHCH. But the directions to the transmitters come into play as well. I'd be surprised if it is co-channel interference since the offending channels are almost 180 degrees away. That's interesting.
More likely is that Mt Mansfield signals are 2-edge and over 100 miles away so hot-spots and cold-spots are probably abounding at your locale. I get the Mt Mansfield stations from 72 miles in the other direction and had to work very hard to find a hot spot that worked for all five of the American stations.
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