I have a pair of GM 300 radios, one is a 16 channel, one is an 8 channel, a
RICK kit, a Sinclair 6 section mobile duplexer, mounted to a 19" rack pannel
and works 100% the radios are 25 watt, and
are in the 450-470 band. I just pulled it out of service because of
loosing our spot in the building and on the tower due to a massive rent
increase by the new owner. $400 plus shipping. Re programming and re
tuning of the duplexer is available for small additional cost.