Try attenuating the signal.....if you're near a NEXTEL site, it'll ruin your 800 MHz reception.
There are a few Georgia cities that have great reception everywhere, except near a collection of cell antennas. I did an FCC search and found they contained NEXTEL & SoLinc freqs. I asked a radio tech and he suggested the ATT when traveling nearby. Albany is a great one, if you're near the mall. Atlanta has several spots.
There's a tower up north 247 close to the National Guard gate, then there's a tower behind WRPD/Young Ave. I'm just off Ignico. Even though im around alot of trees, that shouldn't make a difference since im not far from the old Flint building.
Right now ATT doesn't quite help. It's just as bad. Since I'm in a trailor, I put a glass antenna on my window and have it sticking straight up and still doesn't do any good.
Also a while back I wasted money on a GRE amplifier. I'm sure you know the result of that.
Let's put it this way... Since the control channel is on 855, it's very weak. 854-855 is terrible. 856-857 does alot better. What's the point of the TRS only using that short range when they got more towards 860? I know the first is a beacon.