A few years ago, I helped Mike SM3WMV out by shipping some electronic parts to Sweden. In return, he gave me a set of PCBs he had designed for a 6×2 antenna switch. This is a switch box that lets two radios switch between 6 antennas – perfect for SO2R. Mike’s design is as good or better than switches available commercially, with 70db of isolation or better between radios.
I finally got around to purchasing the relays and building the 6×2 switch. It works very well, and has replaced the rats nest of antenna switching I have used here for the past 16 months.