The Genuine BMW Amplifier Rear Window Antenna (315Mhz) - 65209167134 is a high-quality, factory-made antenna designed specifically for BMW vehicles. It is used to improve the reception of radio signals, particularly for the 315Mhz frequency. This antenna is located on the rear window of the vehicle and is an essential component for clear and reliable radio communication. It is a genuine BMW product, ensuring the highest level of quality and compatibility with your vehicle.