We've had so many people have issues with COMAND when using a non genuine GPS antenna that we now keep the genuine Mercedes GPS antenna and a special adapter cable used for the CD based COMAND systems, in stock. If you want an antenna that works, with the correct impedance for your comand, then this is the one.

This antenna adapter connection type is not suitable for cars with the newer DVD based COMAND systems which uses the other antenna/adapter that we have.