[StephanieS]

What combination of signals do you seek? Greensboro only? Roanoke only?The "two birds with one stone" approach?

Greensboro is fairly simple and ought to yield you a full stable of affiliates. Roanoke has some possibilities. It all depends what you want.

Are you shooting through trees etc.?

The CM5020 while a quality antenna, in this application I would not have selected it. All your receivable signals are UHF save for PBS in Roanoke which is on real channel 3. WCYB on real channel 5 from the Tri-Cities is very weak and at best would only appear under the most ideal conditions.

If I were you I'd go UHF exclusive design mounted on the roof. If your foliage isn't obtrusive you could use an Antennas Direct DB8e. One panel pointed to magnetic 160, the other to magnetic 7. The signals at magnetic 307 are so strong pointing away, they should still decode fine.