I also came up with a contraption to hook the antenna when not in use. I had a few stainless steel items and chose the best one. The rope on the other end was tied to the roof rack. It bent the antenna just right and it did not touch the rear door.
The first time out with the antenna up, the homemade bracket swung way back and hit the plastic pieces. To fix the problem I placed a bend in the bracket which touched the door hinge. This kept it from swinging up and down.
SWR reading for channel 40 - Perfect. No reflected signal whatsoever.
SWR reading for channel 1 - under 1.5
Antenna sticking straight up. Only using a rope to hold it down. The stainless steel contraption I made was slipping against the outside and rubbing the antenna.