The reason I ask this is because in my old GM Truck, I had XM and I knew there were spots along side mountains where the signal would fade out. On my wife's Sirius equipped vehicle we never lost signal in the same places. Figured it was because of the original Sirius Sats weird Figure 8 orbits vs. the Geostationary XM Sats. Now in my Sirius equipped Ford Truck I am losing signal in the same places I lost it in my XM truck. Did they move all programming to the XM Geo Sats?