WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Unscrew fastening screw -arrow 1-
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Fig 1: Removing Antenna
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Disengage antenna on centre console and remove to the front.