nsjames,
If I were in your shoes, I would at least try Columbus reception just to see what you get. I agree with the others here that it looks bleak, but sometimes you just get lucky & may get a few of the stations with enough reliability for regular viewing.
I put up a 91XG with similar signal strengths/distance & was pleasantly surprised at the results. With noise margins below -13, 5 stations have decent reliability & 3 more are watchable 50% or more of the time. We ended up using the Winegard 4800 UHF only preamp. It worked noticeably better than the CM7777.
Good luck!!
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