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I had a TV at the end of a long run like yours, and added a Wineguard amp that was adjustable, I'm at work now or I'd get you the exact model. I think it was a LNA200, but not sure. It helped in that case.
But,
Do the test as Joe suggested first, if both TV's show the same symptoms then it's the long run. Then either try a separate antenna, (best solution), or try a low power/adjustable line amp.
If you go the amp route make sure it's a low power or can be adjusted to just the minimum power needed. Since the TV is "almost" getting enough signal it will be easy to overload the tuner. Also put it on the coax that just supplies that one TV only.
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