Keyword "poly-frequency"
1 sites have this keyword listed in their metadata, here's one you may hate:
Weirdly sounds like a voice talking with klaxon horns in background. The voice is just reading off NATO phonetics. Wonderfully creepy. Most of this stuff is data on side frequencies and probably encoded.
4724 kHz
Audio: NA5B WebSDR, somewhere in Washington, D.C.
en.wikipedia.org/wiki/High_Frequency_Global_Communications_System
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