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>This doesn't mean LightSquared signals would travel outside their allotted spectrum. Rather, most GPS devices are incapable of filtering out signals from adjacent frequencies—particularly when those signals are many times stronger than the signals GPS devices are supposed to receive.
Incidentally, this is exactly the reason Iran was able to capture the American advanced spy drone recently. The drones are fully automated and remote controlled in flight. But the level of latency needed at the critical takeoffs and landings require that a ground based GPS unit be present relatively close by to finesse these portions of the flight so as not to risk a crash. It is believed that the Iranians used a ground based GPS signal that simply overpowered the signal that the drone was expecting from the US localized source. They then sent new landing coordinates to the drone, which thought it was responding to the correct signal.