Like a distant truck idling..very low I think it has to do with smart meters and smart wifi enabled technology. They have put a wifi based monitor system in a few days ago to watch over peoples yacts. Also I suspect one of my neigbhours may have got a smart home setup.
Usa, west palm beach · 2018-12-19 · from the WORLDHUMMAP archive
An account in Usa, west palm beach
What they reported
First noticed: 2018
Pitch: Sine wave and at 100hz or even lower.
Loudest: Equal night and day
Where: Equal indoors and outdoors
Symptoms: Sense of vibration, Its intrusive
Changes with weather: Not that ive noticed. Used to live in London, heard it there, moved to Florida, havent heard it here in years, and a few days ago it started.
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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.