Some of the speculation I've heard is that these drones have an auto-return-and-land mode that could be triggered by successfully jamming the communications lin

Some of the speculation I've heard is that these drones have an auto-return-and-land mode that could be triggered by successfully jamming the communications links. It may be that the auto-land was designed with the hope that the legitimate operator would take over with a direct control when then drone got close enough to home base. It may be that the thing wasn't really able to make a completely graceful landing on its own. Sounds plausible to me. Russian-made GPS jammers have been reportedly on the market for over a decade now. Alternatively, it might also be enough to simply fly your own plane and GPS receiver some relative distance away from the drone and rebroadcast the signals received from there with a higher strength. Of course, this type of forwarding attack could end up with the Iranians landing a plane of their own at the US base. That would be bonus points for style. :-)