Since moving to our smaller home in Thornbury I've been observing the noise on HF. It varies widely. Sometimes, 40m has broadband S9 noise.
At other times it's pretty good.
Sometimes the noise appears to be from a switching power supply (and this pattern is repeated all across HF!)
20m can be pretty good at times.
The noise canceller I built can work on the switching noise but can't help with broadband noise. Sometimes the most practical way to do ham radio from a suburban home is to transmit locally and receive via a near by WebSDR.