WARNING: This page is about a different car, the 2015 Audi A7 Quattro and 2014 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Roof Antenna -R216-
Courtesy of AUDI OF AMERICA, LLC
GPS Antenna -R50-, blue
Not assigned, white
Satellite Antenna -R170- /Auxiliary Heater Antenna -R182-, green