[Spooks] Juanita Castro was a SWL

[JF Brulotte]

Not a number station, but almost...

"He told Castro she would receive information through shortwave radio communications. Castro chose a waltz and a song from the opera Madame Butterfly as the signals her handlers would use to let her know if they had information for her."

Ref.:
http://www.google.com/hostednews/ap/article/ALeqM5hKhlTuJ4j2wP_PdNlRFYfX4-mOrgD9BIUB2O0