I haven't tried the whole thing seeing if I got the noise when I turn to the ON, but I have noticed mine making the noise when I am driving down the highway though. I have my cable running along the headliner and then dropping to the floor along the siding where the driver seatbelt is bolted. I have my CB mounted under my driver seat and my power running from my cig lighter. I am thinking about making me a ground-loop feedback filter when I get back to school.