has anyone tried to swap out their GPS/XM antenna for a hybrid antenna with am/fm/Sirius/navi?

I found this link DIY: OEM Sharkfin "Hybrid antenna" install [Archive] - Volkswagen Owners Club Forum |VW Golf / Jetta /Passat /Beetle/EOS/Rabbit/GTI /CC/Bus/Touareg/Tiguan/TDI while i was looking for a hidden am/fm antenna so i could get rid of the POS whip. Ideally I'd hide all of the antennae.

I found this link DIY: OEM Sharkfin "Hybrid antenna" install [Archive] - Volkswagen Owners Club Forum |VW Golf / Jetta /Passat /Beetle/EOS/Rabbit/GTI /CC/Bus/Touareg/Tiguan/TDI while i was looking for a hidden am/fm antenna so i could get rid of the POS whip. Ideally I'd hide all of the antennae.

