Hi randy Same happened in our system LU3AOC, VHF was unusable at all and UHF was heavily degraded by bloking signals from FM station and 490 Mhz repeaters co-located. We choose Bp-Br duplexers and then we noticed that was not enough, remember of Bp-Br does not help in out of band frequencies. The RX performance is really bad compared with other analog repeaters from Icom. In the case of VHF we made a notch filter combined with a hi pass at 95 Mhz and VHF improved a lot http://www.lu1cgb.com.ar/filtro_de_vhf.htm
In the UHF case, we install a band pass filter in the RX side with 0.8 db of atenuation, just one single cavity, and now it works great. Regarding antennas we use a single antena for each repeater, and in your case the duplexer can help a litlle. Regards, Adrian LU1CGB
