I do most of my old radio repair and restoration in my building that is in a complex of storage and workshop buildings. The only utilities available are natural gas and single phase electric, no water or sewer, so it really can't be considered as an industrial complex.
The interference is totally unreal! Most of it is from the line, a nasty buzz.
I'm blaming the remote reading electric meters. I was trying to trace the noise from the area with my Optima high performance portable radio, similar to a GE Superadio. You put the radio next to the electric meter and it emits all kinds all kinds of strange noises.
I'm calling the electric supplier.
