mlord had talked in some previous threads about a few electronic and/or electromechanical switching devices that could be used.
A thought just occurred to me - a Radio Shack Infra-Red A-B switch in a weatherproof box mounted right up by the two antennas could be activated with an IR Blaster trigger unit from a computer or DVR... the problem is that you'd have to run a power lead up there for that switch.
I did a home made one using two 5volt 75 ohm RF relays from Omron (3 antennas). They are just little things, but the trick was to wire it up using 75 ohm all copper coax. Looks sloppy, but I kept the shielding maintained and it works pretty darn well. I took no pictures (construction was embarrassing although functional), but I could draw something up if somebody is interested. This is installed before the preamp (I'm cheap and don't want to buy more amps ) and I have no noticeable loss although I'm sure there is a little. Works well in my situation though
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