The UHF antenna shown in your first thread may be a 'cut-channel' design, meaning it was optimized for a single channel. If that was the case, it would still make a pretty good UHF antenna but could have poor performance at particular frequencies.
Have you experimented with alternate locations that avoid trees?
Failing that, consider trying a Winegard HD7694P pointed at about 300°. It has more gain than your TVFR suggests is needed, but I see trees.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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