Hi. I am/have replaced the Command Head Unit in my 2005 SL350 and am installing an Alpine X800D-U connected to a JL HD900/5 Amplifier to run the OEM BOSE Speakers. All working so far EXCEPT I am not receiving an FM Signal at the head unit (the aerial connection from the head unit and up to the Audio Gateway location is fine). I had thought that it would be a very simple case of connecting the aerial lead from the Alpine into an Aerial Adaptor that connects to the OEM Aerial Connector at the Audio Gateway, however, this does not work - I am not receiving an FM signal at the disconnected Audio Gateway. Several of you on this Forum must have fitted replacement head units into an R230 in the past ... where and how did you connect to the OEM Aerial? It is obviously more complicated than just unplugging the 'black' aerial connector at the Audio Gateway and plugging in an adaptor - any clues or solutions please? Thanks and regards Wolfgang Souter Westbury, Wiltshire, UK 2005 SL350 (R230) formerly with Command Face-Lift Head Unit.