Thank you Rudolph, I will try that. There is a brown, factory ground wire that is part of the factory harness that went to the original antenna connector. I believe the origin is up near the radio. The other end, at the antenna location is currently hanging. Should the ground contact in that connector be grounded to the same location? The ground that I am using for the antenna is the factory ground screw which is located at a internal trunk body point that is a few inches from the antenna hole. It's a good ground. The amp has positive and negative wires that come directly from the battery posts (trunk batt location). The case of the amp appears to be common to the neg. Thanks for the great help!