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Re:What is the mysterious 'global Hum' and is it simply nois... by sneak on Sunday October 11, 2020 @03:24PM (#24748322)
Perhaps you could clamp a microphone to a metal rod stuck into the Earth to test that hypothesis.

Same for clamping onto the structure of your house for the vibration/fan one?

Re:What is the mysterious 'global Hum' and is it simply nois... by imagin8or on Sunday October 11, 2020 @04:57PM (#24749028)
Finally, if all else fails, clamp a microphone to your head