You live in an area with enough population density that you need to first determine if the source is on your property or elsewhere. To do this you need to run the radio off a battery (not a UPS). Turn off the main breaker in your home. Account for any battery operated devices such as alarm systems, routers, UPS, sump pumps, etc. that may still be powered.
If the noise goes away, the source is within your direct control. Turn on the main and turn off branch circuits one by one until the noise goes away. Then research everything on that branch.
If the noise did not go away with the mains switched off, it could be one of your battery operated devices is the source or it is a noise source outside of your direct control. In this case, use your G90 with a few inch loop antenna as a portable detector in your house and neighborhood.
- Glenn W9IQ