I just got my AV6 and need to put my serius radio in it. I plan to put the magnet antenna over the rear windshield then run the wire through the trunk and up to the dash. My problem is that I don't understand how to remove the plastic cover running along the passsenger door sill. There are no obvious screws so do i just pull it up? Does this sound like the right plan? In my last car I put the antenna by the front windshield and then came in the passenger door but I can't do that with this car.