Thanks for all the many replies -- really too many to acknowledge all
individually. Simplest solution suggested was DPDT switches or relays with
the non-moving contacts cross-connected "X" fashion, such that when
activated rigs are connected to the opposite antenna feeder, and when not
activated connections are normal. I have some residual question about
cross-radio isolation in such an arrangement -- maybe physically
separating two SPDT relays would do the same thing with more isolation.
73, Pete N4ZR
Sometimes a tower is just a tower
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