You car does have an aerial, in fact it has TWO and has a diversity control in the head unit. The bump on the roof that you see on some golf 6's is the GPS antenna fitted to cars with factory fitted RNS 510's.
I have a heap of info, pics and diagrams on my website, start with this link and a search will provide other info - Aerial | my-gti.com
This will explain how it works, I have mark VI information that will be going up soon when I finish the pages off but essential the mark VI is the same as the mark V except the mark V had one of the two aerials on the roof on all models and had a combo GPS/aerial on cars with factory fitted sat nav.
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