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You can't add the amp gain to the antenna gain to determine your overall NM. It amplifies the noise as well as the signal that the antenna picked up. What you're doing is zeroing out the cable loss. So, you add the antenna gain and subtract the amp's noise figure from the NM in the table to see what you have at your receiver.
I think you'll be disappointed in your Columbus reception results. You've got 2-edge and tropo paths, which are notoriously unstable. You'll need at least +15 NM for reliable reception, and I don't see that happening. You will be able to get the Cleveland UHF stations just fine, though. However, for Fox and CBS, you will need to add a VHF antenna.
Good luck!
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