Not sure if anyone is interested in this, but single (USB RTL) dongle and Raspberry Pi 3 makes a pretty good P25 trunking scanner. I have mine on most of the time and audio is clear, clean and the operation is stable. I'm using a Raspberry Pi 3 with Rasbian Stretch, OP25 and a NooElec NESDR Mini 2 SDR & DVB-T USB Stick (RTL2832 + R820T2) with the little cheap antenna that came with it and it has no problem picking up EMS, Fire, Polic, Sherriff and more from all cities and towns in Johnson County (Texas).
73's
Dutch, KG5WXW