Reducing RFI off the powerline into radio set

[dieseljeep]

Is the large WW resistor, a voltage drop for the radio? If so, what value is it.
My older GE Superadio picks up a lot of interference from the neighbors, even when I'm using it on batteries, but much worse on AC.
It seems like The building next to me has some kind of a motion detector alarm system, that emits an RF pulse. I don't think, I can clean that up.