Quote:
It just blows my mind that it can be great for a while, then not so great, then terrible, then ok again.
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That is one of the defining characteristics of digital reception. It's either perfect or it isn't; there's no (sometimes) graceful degradation that was part of analog reception. If you're already at the edge of the digital cliff, it doesn't take much of a disruption to kick you over the edge.
I'll say it again: If there are trees in front of the antenna, I have
NO expectation of reliable reception of UHF signals. I've worked with thousands of customers (and my own setup) and that lesson has been indelibly ingrained into my advice.