Well i seem to have been a bit premature on the signal quality of the Shark Fin
It seems as soon as i leave my drive it no longer works.
Going to ensure i connected it up properly then will have to take apart and see if i can swap gubbins over from old to new
Alternatively any idea if you can buy a signal booster?
Carl 
Just found this thread. I wanted to do this mod to mine a while back. But after research ws told by a number of people that you cant get any decent radio reception. The cars that you see with these fitted on a Mk5 golf are the early version with the Ariel in the window.
