The Genuine BMW Amplifier Rear Window Antenna (315Mhz) - 65209167122 is a high-quality antenna specifically designed for use in BMW vehicles. It is located in the rear window of the car and is used to amplify and enhance the radio signal for better reception. The antenna operates on a frequency of 315Mhz, making it compatible with most BMW models. This genuine BMW product is made with durable materials and is designed to provide reliable performance. It is an essential component for a clear and uninterrupted radio signal while driving.