Genuine OEM Audi Antenna Amplifier, part number 4K5035225B. This electronic module is designed to boost the signal received by the vehicle's antenna, ensuring clear and strong reception for radio, navigation, and other communication systems. It is typically mounted within the roof structure, often under the headliner. Measuring approximately 0.115 meters in length and weighing 0.063 kg, this compact unit is vital for reliable signal processing. Choosing genuine OEM ensures correct electrical specifications, precise calibration, and seamless integration with the vehicle's complex infotainment and electrical systems.