So, let's say that even what you're proposing is correct(which I'm pretty dubious about).
Is your house longer than 32ft/64ft? Those lengths are halfwave on 20m/40m and make a great radiator. For reference all I need is 5w to get out ~400mi so I'm sure these things are kicking off a ton of RF on those frequencies.
Fundamentally if you have an unshielded wire and you're driving these frequencies across it you're going to see RFI along those frequences(along with the harmonics).
Well I think it's a multifaceted issue, but I am not educated on how your home itself contributes to the radiation profile so I left that bit of speculation out.
Is your house longer than 32ft/64ft? Those lengths are halfwave on 20m/40m and make a great radiator. For reference all I need is 5w to get out ~400mi so I'm sure these things are kicking off a ton of RF on those frequencies.
Fundamentally if you have an unshielded wire and you're driving these frequencies across it you're going to see RFI along those frequences(along with the harmonics).