Hi Paul, I bought a used Speedpack spoiler and fitted it at the weekend however the connector for the built-in antenna doesn't fit any cable so far supplied by Jaguar (I may start my own spares shop soon!) If I can resolve that connector issue there looks like a bit of a wrestle ahead to route the cable from the existing point where the old antenna is through the tailgate to the spoiler. I will buy a box of clips ahead of that as from past experience they couldn't be more fiddly and likely to break.
Will let you know how that goes.
I am removing the old antenna anyway (its already disconnected) and the car is booked into Chris Gregory's car finishing shop in Knaresborough in May to have the wing filled and painted.
BTW, I did fit a marine antenna and hid it in the rear of the roof lining. Radio 1 and 2 work OK, Radio 4 hit and miss. Some local stations are OK, AM is non-existent.
Cheers for now
Rick