Ok this is going to generate a lot of replies, a very good thing. Or at least I think it will. You are stuck inside the house, you got nothing better to do. I want each of you to do a simple experiment by performing a DC Ground Loop test. It is really simple most of you can do. Should be educational and fun. Some conditions must be met. Most stations meet the conditions. 1. A 12-Volt CB, HF, VHF, or UHF Transceiver. Example a 100 watt HF Kenwood Transceiver, or even a 50 watt VHF/UHF. 2. External 12 volt power supply like an Astron RS-35 3. External antenna you think is properly bonded to ground. Most of you meet these conditions. So here is the test procedure. 1 Turn off radio. 2. Disconnect the Radio's black negative wire from your power supply. Leave Positive, antenna, and all other connections connected normally to radio. 3. Turn Radio ON. Pretty simple test just about anyone can do. If your radio turns on, you got yourself an extremely nasty ground loop. Last place you want your radio to be is in a ground loop of any kind, and DC is the worse of them all because it means you are in both a DC and AC Ground Loop. It means you got all kind of common mode noise running through all your ground wires and your radio is now a circuit conductor full of signals you do not want. I will not tell you what is causing it right now, but I will give you a hint with another test, step four. 4. Disconnect antenna from back of your transceiver. Did you radio turn off? There is another way to do the same test if you have a Clamp-On Amp Meter or even an ole fashion shunt amp meter. Measure the DC current in the positive and negative battery to your radio. They should be equal, but for most hams will not be equal. Some of you will get what you expected, disconnect the power, and the radio will not turn on. However the majority of you are in for a SHOCK when your radio turns on. Warning do not try to TX with the negative disconnected. You voltage will sag to low if you try. Report back what happens.