if someone you are riding next to has a sattilite radio add on using an FM modulator and you tune into the brodcast signal, sure.
but i've always wondered how you could design your own receiver to pick up the sattilite signals without actually going through Sirius or XM for the equiptment. after all, the signals are all around us in the air right?? like AM/FM signals and the old crystal radio deal, lol.