UKPassats

I currently have a windscreen DAB aerial - and its ok around where I live but on long journeys its rubbish.

I am under the impression that some passat b6 have dab antennas as part of the rear screen and just need an amplifier and cable running (the amp module that fastens near the back window needs swapping)

Does anyone know if this is true and if so what part numbers do I need?

Thanks