So something else I've found trying to listen to this system with the 436hp, is that u can not listen to other system in your favorite list or data base. Even after analysing the system it doesn't want to keep the quality when scanner other systems. I've tried it mobility and stationary. If you analyze the system then hold on the system it works fine and I've done this mobility and stationary. For the past couple days while I'm traveling within the county I've tried the less antenna approach with a 3" stubby attached to the scanner (no external) and had pretty good luck so far. Scanner seemed to work better clipped to the visor than sitting on the passenger seat or center console. Hopefully this little bit of extra info will help for anyone who is trying to listen to this system and others on the same scanner.