This excerpt taken from the SIRI 10-K filed Mar 16, 2005.
Satellite Uplink Facility. In April 2004, we acquired a satellite uplink facility in Vernon, New Jersey, which we use to command, control and communicate with our satellites. Prior to April 2004, we leased facilities at this location for the same purposes. During 2004, we transferred our primary satellite tracking, telemetry and control functions from our national broadcast studio to our facility in Vernon, New Jersey. These activities include routine satellite orbital maneuvers and monitoring of our satellites.