I just got my Sirius radio about 1 week ago. I had it installed by CC and they used an FM modulator to silence the FM antenna. I have the Streamer GTR recv'r. I have a 2004 Ford Mustang GT Conv't. My signal is always at least 2 bars. However the music quality sucks. My FM sounds much better than my Sirius, which sucks. Any suggestions or is that just the way it is, thanks in advance!