I am having a hard time finding (and maybe they don't yet exist) any sort of truly portable devices for Sirius radio. I use the radio in the car, in the home, and on my travels and I would like to have a device that I can just plug some earphones in, maybe carry some sort of small antenna if need be, and listen to the radio. Can this be done yet? I thought XM had something like this already, and I just was wondering if that's true and if so where is the Sirius alternative? Thanks in advance for your insights.