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Having recently helped some friends with TV antennas in both Blairsville (getting 9, 12 &13 from Chattanooga from a 60 ft tower) and Cleveland (getting 36 from Greenville and 24, 31, & 51 from Atlanta using a rotator), your signal analysis is somewhat more hopeful for picking up a couple of the major networks reliably. I think your conclusion that Chattanooga is your best target is right on the money.
Your best bet is to concentrate on real channels 9 (ABC-WTVC) and 13 (NBC-WRCB). The AntennaCraft Y10-7-13 would be my choice aimed at 285 degrees magnetic and mounted as high as possible. Use your existing CPA19 preamp mounted as close to the antenna as possible and keep the coax to your TV as short as possible to minimize losses. I would consider it 'frosting on the cake' if you were to get a reliable signal from channel 12 (CBS-WDEF).
My suggestion would be to focus fully on those VHF-Hi channels for now. The PBS stations to your NW in NC should be easy to receive, but if you want to shoot for channel 42 (CW-WFLI) or channel 40 (Fox-WDSI) it is going to be a much tougher row to hoe. The Antennas Direct DB8E with a pre-amp and short coax feedline would be a good choice.
Your biggest enemy is going to be trees. Make sure the location you choose for your antenna will have as few trees as possible in the path of the signal while still keeping your feedline as short as you can. Height is your friend in helping to clear the local tree line. The signal attenuation will get a lot worse in the spring when the hardwoods leaf out.
Good luck! Let us know your results.
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