I have a GM300 setup, but now I need a duplexer. Is it possible to get one tuned for RX "467.xxx" and TX "462.xxx" and not the /exact/ frequency? I would like to hop between frequencies as I travel without having to pull out a duplexer for each pair. Also, if I want to scrap the duplexer idea altogether and just do two antennas, any thoughts on distance between the two (at 10watts)? Regards, KQUN760