Thanks for that info 50sqnwop/ag – it’s fascinating stuff.

I just found this page which also gives a little detail on these ops.
http://www.hyperstealth.com/DonHings/first-walkie-talkie.htm

Interestingly it states in the write up on that page that the top secret use of this system wasn’t declassified till 1976, yet the radio show was made in 1950!