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You might find these articles informative on just how much can be done with HAM and, in the article on Operation Moon Bounce, the use of vessels disguised as another type of vessel to secretly receive(and send?) comms. Wonder if any advancements in technology (ie miniturization, resistors, microprocessors) might have occurred to allow even smaller disguised vessels to accomplish what they did on those old navy transports converted into “research” vessels.
https://weather.com/weather/today/l/43.91,-100.05?par=apple_widget&locale=en_US
https://airandspace.si.edu/stories/editorial/operation-moon-bounce