Hello, This is my first post, and while I did do some searches, I hope this hasn't been addressed somewhere else. I am a dual subscriber. I have a Pioneer head unit and then the two boxes (one for Sirius and one for XM) mounted under my seats. My Sirius antenna is on the roof, and my XM antenna and NavTraffic receiver are on my dashboard. I had Sirius first, then got the XM for the MLB. But now that the channel lineups have merged, I am contemplating dropping the Sirius service as I can get everything with XM + BOS. HOWEVER, my sound quality on Sirius absolutely smokes XM. The XM sounds more like FM, whereas the Sirius sounds like a CD. This is for music and talk stations. Lots of static/distortion feel to the XM. Could this be antenna location? One other thing, when I go into a tunnel and the services go out, the Sirius just goes silent, but the XM has static. Almost like there is static in the signal. Should I move my antenna? I would like to keep XM and dump Sirius since I like the NavTraffic, but sound quality is more important to me that the NavTraffic. Any suggestions would be great!