I am trying to install a portable Sirius radio to my system. Reason being it has a lifetime sub that cannot be transferred. When I hook up the antenna switch and turn on the Sirius, the FM radio does cut out but the Sirius does not play. It was working two weeks ago in a different Honda. If I connect a straight rod antenna to the FM it does not work either. Is there something special about the antenna on the vehicle that the radio needs to 'see' to make it work?