Arial?

[Enty]

Hey, I had this idea as well, but thought you'd probably have to take the whole roof lining out to fit one?

[JIC Cracked]

I have done this on 6R already, looks great

There is a how to guide, http://www.golfmkv.com/forums/showthread.php?t=3508

I took me about 20 mins to swap both of them over, but you have to take care with the roof lining!

Plus you have to swap the pink plug for the white one on the old aerial

[JIC Cracked]

Dude I got mine from a VW Main Dealer, I think it was £37.00 but the aerial is the same one as Audi TT 8J new model.
eBay worth a shot, they are bound to pop up.