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So the tree surgeon came out, trimmed some dead wood and problematic branches, and took out a tree in decline. This wasn't the reason for removing the tree, but as a bonus, it may have been partially obscuring the signal path. The UHF antenna is at 20 feet. That doesn't sound very high, but the roof has only a two in twelve slope, and is at a higher elevation at the surroundings. Looking at the antenna from the back yard, my reaction is 'That's a seriously high antenna.' I don't think I or SWMBO would like for it to be any higher.
Anyway, the results are very good. PBS (KQED), which is mostly what I wanted, comes in reliably. I'm even a lot of the time getting KCSM, a community college station 120 miles away.
So it seems that elevation helps, and probably removal of vegetation that may be in the way.
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