Thanks for that information. It's more or less what I expected to hear but now I'm not just guessing or assuming. My guess is that it is the signal bouncing along the roof because I wasn't having these kinds of fluctuations when it was in the house the prior winter.
Regarding raising the antenna, how much higher are you thinking? I have it on a j-mount installed on the facia at the apex of the roof. Is there a way to add an extension of the type required? From what I've found, taller j-mounts will only get me another 6" or so.
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