Genuine OEM Volkswagen Roof Antenna Amplifier, part number 3G9035577J. This module is located on the left side and is designed to boost the signal received by the roof antenna, ensuring improved radio and communication reception. It plays a crucial role in maintaining clear audio and data signals. Weighing 0.05 kg, this amplifier is engineered to precise electrical specifications for optimal signal processing and long-term reliability of the vehicle's infotainment system.