It's probably not necessary to shoot over the trees. Your signals seem reasonably strong, so they may be good enough to pick up through the trees. There's no good way to estimate how much signal loss trees will cause other than trying it, but most people can successfully get their signals this way.
For a good UHF-only antenna, I'd lean toward the Channel Master 4221, Channel Master 4228 (for a little more gain), or the Antennas Direct 91XG (this is a Yagi style antenna as opposed to a bowtie style).
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