What kind of antenna are you using?
In terms of trying to find the worst offenders, you need to start "diving the universe in half".
Meaning, instead of trying each device one at a time, start testing if the biggest offenders are "in this half, or in the other half".
Step one, flip the main breaker in your house and use a battery powered receiver. Is the noise still there?
If it is, the source is very likely outside of your own house.
If it's gone, great, the noise comes from your own house.
Then turn power on one breaker at a time. At what point does the noise come back?
To do that will take no more than half an hour, and at the end of that you'll have a very good understanding of where most of the noise is coming from.