Tnx for all the suggestions. Replacing the exisiting DB420 is not really an option, and since my experience with that antenna has shown it to be broad-banded enough to cover both GMRS and Amateur with little heartburn, I was mostly interested in the concept of combining/isolating the two radios without too hefty an investment in new hardware. Our ham club has on hand a good assortment of (mostly 4 can) Motorola/DB Products/Celwave UHF duplexer assemblies; will have to talk with the guys to see who has what.
I recognize the potential headaches such an installation could generate if not properly executed, and may ultimately just look for another site (heck, I'm always looking for sites...who isn't?) for the GMRS. Anyway, my thanks again. 73 es Happy Thanksgiving de K5IQ Bob
