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indoors it get's its signal from either a wifi network (many people have wireless internet hubs) or from using a "home" kit which uses a std sirius antenne which works best with a clear shot to the sky.
on the main menu of the tuner (in all digital graphics) is where you select if you want to listen to "internet sirius"(wi-fi) or normal sirius (the satalite signal).

i do not believe you can download individual tracks for a charge, i think when they say.......

" plus go online and purchase your favorite tracks for downloads. "

they mean that you can purchase and download tracks online via itunes or whatever to your computer and then transfer them to your stiletto.
i'm going to give napster a shot for their free 7 day trial and see how it works.....