After that bird knocked off my magnet mount Wilson 1000, I put it on the trunk lid so it couldn't go anywhere again. Unfortunately, it didn't tune very well there and it just didn't seem to receive as well.
I decided to order the roof mount assembly. It requires a 3/4" hole, which can also take an NMO mount or a plain rubber plug to make it look reasonable if I ever want to get rid of the car.
Pictures in this thread.
I hope this doesn't count as cross posting, just trying to be efficient...