Where do I plug in the radio antenna extension cable for the Dynavin W211 or SLK head unit?

Where do I plug in the radio antenna extension cable for the Dynavin W211 or SLK head unit?

The OEM AM/FM radio antenna connection in some of the Mercedes E Class/CLS (W211) and SLK models is located behind the rear seats in the trunk. Therefore, the Dynavin W211 & SLK includes a AM/FM radio antenna extension cable that will need to be plugged into the Dynavin in the dash and run to the car's trunk. See images below for location of antenna plug in an E Class W211.

Please email support@DynavinNorthAmerica.com if you need assistance.