I am going to install a sirius radio antenna in my wrx wagon. Does anyone have any ideas on how to mount this so the wire for the antenna does not have to pass thru where the window is going to close on it? It is one of the magnetic types that go on the roof. I was thinking that if there was enough length to the cord i could run back to the rear of the car and then mount it in the back of the car just behind the spoiler. Any ideas or better ideas?