Rod antenna, location/purpose - GF82.62-P-4115SK

MODEL 171.4 

Fig 1: Identifying Rod Antenna Location

Courtesy of MERCEDES-BENZ USA

Rear window antennas, location	The rod antenna (A28) is installed on the left rear fender seen from driver's seat
Rear window antennas, purpose	The rod antenna (A28) converts the high-frequency oscillations of the electrical field in the air to a radio frequency alternating current