N-a-B - True as it applies to Reaper/Predator types, over land. Even for such aircraft it is not quite as applicable over water, because the airborne sensor can out-range any defense except an AEW + fighter combo. And as sensors and electronics get smaller, I can find big metal things at sea, if not at oceanic range, with swarms of very small UAVs (think ScanEagles or Integrators) that are hard to detect and hit.
Indeed. But that's not the vulnerability I'd be going after.....