The glideslope transmitter is 1,000 feet down the runway from the threshold, and the localizer transmitter is at its far end. Equipment powerful enough to disrupt the ILS at that range wouldn't even fit in a hotel room, much less be carried there in a suitcase. Anyway, waiting for instrument conditions that would make the landing phase vulnerable could be very tedious - and many airports never have Cat II, much less Cat III weather.

But if a laptop-sized RF broadband noise generator were located a few feet from a critical harness of aircraft wiring, who knows what havoc could be wrought?