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1 members (Russ Tanner),
11,646
guests, and
138
robots. |
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Key:
Admin,
Global Mod,
Mod
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Joined: May 2009
Posts: 13,370
Founder Master Elite Member
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I call it the HAARP hum, but I don't really know the source.
I hear two distinct types. One is like a sine wave (smooth) and at other times it's a rumble. They are definitely different for me.
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