RQ-170 Spy Drone impossible to bring down with electronic hijacking

The Iranians claim to have captured a top secret US unmanned drone using electronic warfare. This represents a major loss of stealth and sensory technology for the U.S. However, if the aircraft is indeed stealth, it would have been impossible to "hack" into the airplanes controls and take it over remotely.

A stealth craft has to maintain radio silence to avoid detection. Therefore, the craft must fly completely on its own, guided merely by its AI. Thus, the aircraft has no need for ground control. It would be impossible to hijack from the ground using electronic interference.

More likely the craft suffered a mechanical failure or fuel loss and gently crashed.