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I use an RF switch board with HMC849 (important because it goes down to DC) in conjunction with a relay module with ESP8266 (then flashed with the Tasmota firmware).
This is certainly not the ideal combination, but works well enough for me with 2 antennas.
Regards, Steffen
I also ordered this kit from LZ1AQ a few weeks ago and now it's here with me, waiting for me to finally build the loops. ;-)
Maybe I'll have a few hours over Easter to test the kit. I will also report back.