[Spooks] Letter beacon in Florida?

[Utility World (Hugh Stegman)]

Propagation favors a location in Arizona or the California desert.  These
are real low power and very likely placed by hobbyists in extremely isolated
areas.  One of the transmitter designs has a frequency that drifts downward
at a constant rate while the carrier is keyed.  It's pretty distinctive.
Then there was "Yosemite Sam," coming from a test range operated by a
civilian defense contractor in New Mexico, which seemed to be a somewhat
more complex device with purpose still completely unknown.

-hugh