Hello. Has anyone fooled around with this circuit?

 

not for this use, but it is used for electronic comutation in some rdf equipment. switching four antennas and to determine direction by phase of recieved signal.

 

I think it's the greatest radio circuit I ever saw. It was designed in the 90's. I have been an analog guy all my life. This simple switch solves so many communication problems, I am surprised it isn't used in radio more often.