Isn't UPN being transmitted, at least part-time, on a secondary channel of one of the big 3? I can't remember if it's ABC, NBC, or CBS, but I sure thought I saw it recently.
I'm east of Halls, but still just off of Emory. Even with a secondary ridge between me and Sharp's Ridge, I get all the stations DaverJ mentioned at 85% or better. WBXX can be a bit flaky, but I can move my internal antenna and pick it up pretty well. Assuming you're using the CM4228 outdoors, you should receive everything pretty well - unless you are behind a close proximity hill. There's a lot of bedrock around Halls, so if you end up behind a hill, you may need some additional height.
You may also pick up some of the stations east/west of us, but they will mostly duplicate those broadcast from Sharp's Ridge.