The SIRIUS Starbase may have a name right out of science fiction, but in reality it's a spectacular way to add the space-age entertainment of SIRIUS Satellite Radio to any car's FM radio. The package comes with everything you need: a SIRIUS tuner, an FM modulator, a dash-mountable display/controller, and a roof-mount SIRIUS antenna. The compact, easy-to-read display is perfect for vehicles with limited dash space.The ultra-compact tuner box will fit under your seat easily. The FM modulator connects to your radio's antenna input, and the modulator then "broadcasts" the SIRIUS signal over an unused FM frequency (you can select any FM frequency, from 87.7 to 107.9).