Andrew, Yes to have the Yagis switchable is (almost) essential particularly on 2M where the polarization can change during a pass. I have a control box (homemade) which switches the Polarization and the pre-amps (on/off). Robin Haighton VE3FRH
What is the best way to set up phased crossed yagis ?
Have an electric coax switch in the middle to switch from left to right circ polar ?
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