Most of you will use the SRWH-VW211. The SRWH-W211-HILO is recommended if your radio has 2V RCA outputs. We recommend radios with 5V RCA outputs for best sound but 4 volt outputs will get the job done.

The AM/FM antenna connection is in the trunk. The AA-W211 will reuse the factory antenna. For better reception or if you do not want to run a cable to the trunk recommend the window mount antenna. ANT-UNI1

You are buying a radio that uses an external GPS antenna. If you have a factory navigation radio it has GPS antenna cable connected to the Navigation module in the trunk.. You can use this adapter to reuse the factory antenna with your new radio instead of putting the new on on the dashboard.

Since the GPS module is in the trunk you will also need this cable to connect to the GPS Antenna in the trunk.

If you are installing a reverse camera you this item give you power from the back of the radio. Older B6 A4's that did not come with roiling steering wheel controls do not always have the reverse signal in data signals behind the radio so this item will not work with that car.