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Signals from Same Tower, but Some Good & Some Bad?
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Because different frequencies diffract at different angles when crossing the boundary at the terrain obstacle. It's further complicated by the variable effects of temperature and weather conditions not only over the whole signal path but very specifically at the location where the diffraction takes place. If that location is tree or snow covered, then those are additional complicating factors. If your signal path is calculated as "2-edge", then you're getting a double dose of diffraction and the difficulty level rises exponentially.
Your best plan of attack in such cases is a telescoping mast that you can adjust in small (6-12") increments to see if you can find an antenna height where the layered signals line up. This will require substantial patience and persistence, especially when you find out that the "best" antenna height changes with the season or the weather up on the mountain.