AnomalyLow choppy sound of a Helicopter in the distance at times it sounds like it is moving closer but a helicopter never appears I live 12 miles from Beale AFB which has a Pave Paws antena when I was stationed at Beale in the early 80s it would interfear with FM radio causing a very slight sound of what I would describe as chiems. I could also described it as tinny rain sound very faint.
Marysville, CA USA 95901 · 2019-09-24 · from the WORLDHUMMAP archive
An account in Marysville, CA USA 95901
What they reported
First noticed: 2019
Pitch: 4 Hertz square
Loudest: During the night
Where: Equal indoors and outdoors
Symptoms: Insomnia, Sense of vibration, I only notice it when it's quiet
Changes with weather: hard rain covers it up
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.