I soldered on a piece of coax to the Silab over the weekend and plugged it into the TV antenna, was hearing C Fm in Toowoomba and SeaFM at the Gold Coast Clear as day with no static. I'd check your car radio antenna.
I had a TV coax splitter (Y-piece) at home, so went up to Dick Smith and bought a couple of fittings, and installed the splitter in behind the dash so I can have the Silab and the head unit sharing the car antenna while I work out how to build my carputer. A couple of us went for a drive up to Mt Mee via Woodford yesterday and I had clear reception all of the way until recepton dropped out for the others as well. I will be looking for some solder on fittings if I can find them.
Mine was the other way round, I had noise in the MP3's and a clear radio.
I could not get Silabs going under RR so have been using ICERADIO. Today, I downloaded FreeIce from Digital-car today which is what Millsy is using and I go to tell you I think I am going to ditch Roadunner in favour of it. Everything just worked out of the box incluing the radio.. and the interface is so much easier to use than anything else.
Anyway, got excited enough to drop in to JB today and found they had a 20% off sale, so bought an amp and some good splits, so ready to rock and roll with this seriously now (once I install it all). As my rig is a ute, I have not got room for a sub. I have only gone with a 2 channel amp as that's all my my laptop sound card supports. We decided that we probably wouldn't hear the rear speakers over the splits... Decided not to buy the $650 Focal splits, but got JB's which were $379 list price less discount.