I hope I am in the right forum for this. I have a Larsen dual band antenna. I currently use a couple of Motorola Genesis series portables in a vehicle adapter in my truck. I currently have a UHF motorola brick amplifier (n1275a) that I hook up for 70cm and GMRS use. I need to keep the GMRS capability as that is what I use with the rest of the family who don't have ham licenses. I am looking to add an amplifier for VHF. I am hoping to avoid having to use a manual antenna switch, or having to swap out amps each time I change portables. My options as I see them are find a dual band amp that is good up to 470mhz ( which I have yet to find), or, Feed line off the convertacom to a duplexer (MFJ-916B or equivalent) to the amps, then another duplexer and a single line to the antenna. What I am worried about is potential losses on the receive side. Thoughts?