Alright. Sorry If I misinterpreted your question. I was trying to find out about the impedence matching system on the wilsons and on the web site for wilson it just calls it a ground. (Seems to me its being used for the same job either way) My guess is still that if the mount isn't grounded through how it's attached you'll need the wire to be grounded. Just for kicks check out how my antenna looked on my old jetta. People gave me some strange looks!
There's a 108" whip on top of a tunable electric screwdriver antenna that i could raise and lower from in the car.