Hi Russhg,
If Charlotte is your goal to attempt. I recommend a more elaborate set up. This involves two independent and separate systems.
System 1: GUM's recommendation for Greenville. His suggestion is spot on. This is set up is easy.
System 2: Attempt a Charlotte. Install
channel master 4228HD. http://www.solidsignal.com/pview.asp?p=4228-hd Orientate to magnetic heading 72.
Do NOT install preamp. You have very strong signals at magnetic 287. Any use of a preamp will put you at high risk for TV tuner overload. Normally I'd suggest it, but WNTV is laying a wicked signal on you.
Both these systems have separate coax leads. Inside home, use A/B switch to toggle between systems.
http://www.amazon.com/Parts-Express-.../dp/B0002ZPIQ4
As mentioned prior, you have a chance at CBS and FOX from Charlotte. The other networks will likely have drop outs and come and go at best. Charlotte ABC WSOC will not be received in any manner.
This will be up to you if you want to spend the energy and resources for couple of Charlotte signals.
Cheers.