[GarySP]

Hi morzh. By 'dirty' ground I mean not a dedicated ground rod without contact to the rest of my house electrical circuit. I had been led to believe that RFI from other sources in the house could use the existing ground wiring as sort of a highway to the radio. Since it is impractical for me to drive a ground rod into my yard and use it exclusively for the radio, I'm going to use the ground spade of the three wire plug to complete the circuit through my home service. This will allow me to have a ground regardless where I use the radio in my home. Appreciate the info. Take care, Gary