I just got a new TRX-2 and I'm having a problem receiving a P25 system in the next county. The system I'm trying to receive is Anderson County S.C. on Palmetto (P25). I live less than 4 miles north of the county line. I can hear this system every now and then but mostly I just see an S in the display. I didn't think I would have a problem hearing this system this close. I can't use an outside antenna so any advice you could give would be appreciated.