I bought the portable Delphi XM my-fi unit to use in the car and while walking the dogs since it has an external antenna you can clip on, so it functions like a walkman. The reception when using portable is in and out, I'm not sure if that is because we are in the mountains, but if it is hooked up to the home antenna it works great. You can also log into xmradio.com and listen while you are at your computer.

I still haven't hooked up the car antenna, but often just stick the portable antenna up in the sun roof and it generally works OK - there is a piece that plugs into your cassette player so you hear it out of the car speakers, and it also comes with a charger to plug into the cigarette lighter.I really have to find a place that will install the car antenna!