Genuine OEM Audi Antenna Amplifier, part number 4M8035225M. This electronic module is designed to boost the signal strength received by the vehicle's antenna, ensuring clear and consistent radio, navigation, and communication system performance. It is typically located on the rear right side of the vehicle's roofline. Weighing approximately 0.057 kg, this compact amplifier is engineered for precise signal processing. Choosing genuine OEM ensures correct electrical calibration and compatibility with the vehicle's complex infotainment system, preventing signal degradation or interference.