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.
Fig 1: Overview Of TV Tuner
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Unscrew plastic nut and pull out the TV tuner from the holder.