I've got this issue right now on my street - as soon as I turn down the street I get that same noise. Been trying to track it down for a couple of weeks.
Here's a story that may not make you feel any better and others on the forum may remember it from a long time ago.
A number of years ago (5 maybe) I had a house where I had no interference - beautiful quiet signals at night. Good size neighborhood with 80 homes and no above ground power poles.
All of sudden I start getting crazy noise - all the time. Goes on for weeks and I can't figure it out. Then one day it's gone only to return the next day for weeks on end again. Power company sends out their special guy who drives 100 miles from their headquarters to help. We use his equipment we think we track it down to a transformer box, but then he says that he's 100% sure that's not it...the noise is being introduced to the power lines from somewhere. He leaves and nothing is resolved.
I take my walkie talkies and small receivers and walk around the neighborhood - the noise is everywhere - it is super strong pegging my meters for around a 1/2 square mile area - huge range. After weeks of walking around I finally believe I have tracked it down to one house (5 houses away from me). Was super difficult to track down because the noise was everywhere in the neighborhood. The neighbor is nice enough to let me inside his house and once inside my radios go crazy - I think it might be the alarm system as my devices go crazy when I get near them, but then I walk into an office and the radio with squelch up is just going nuts.
Ready for it? It was a @!&*#$ paper shredder. I turned it off and the noise disappeared completely. The power supply inside the paper shredder was causing interference that traveled back into the power lines and through the entire neighborhood.
I asked the neighbor if he would be kind enough to just leave it off when not using it. One month went by with no issues and then bam it was back on. Luckily we ended up moving about 6 months later.
Now here I am again at a different house and I've got crazy noise again. I can tell it's not a paper shredder this time at least