The product is an OEM Mercedes R171 SLK350 SLK280 SLK55 AMG AM FM Radio Antenna with Amplifier, specifically designed for Mercedes-Benz models from 2005 to 2011. 
The antenna technology is AM/FM, and it is made in Germany.
The antenna is designed to be placed on the rear of the vehicle, providing high-quality radio reception for Mercedes-Benz vehicles.

Came off 2006 SLK350 AMG with 81k miles.