I finally got all my stuff together to install my new radio set up in my car (2000 Grand Marquis LS) and something weird is going on with my SWR. I have an Optima MKIII radio brand new on a 3ft/meter/9ft coax set up with a stud mount and a 102 inch whip centered on my trunk. My SWR's are around 3 when I have the trunk closed. When I opened the trunk, about a half inch and checked, it dropped. I then matched it on 1 and 40 and got 1:2 SWR with the trunk open. Then I closed the trunk and it was at 3 again. Things I've tried... Changing coax lengths also tried 3ft/meter/12ft and 3ftmeter/21ft. I also tested for trunk ground on a meter and it's fine as well as any shorts in all coax, connectors, meter, radio, mount, everything. I also tried with and without ground straps. I even tried coiling the 3 diff configurations of coax. I also tried disconnecting the electronic trunk switch to see if that was causing any problems. No matter what I do the only thing that brings the SWR's down is opening the trunk a little. Any help? Thank you.