It has a monitor
While the mass media has been on its usual click-baiting we're-all-gonna-die theme, no one seems to have raised the topic of the ILS monitoring sensors that ensure the beams are transmitting where they're supposed to be.
While my knowledge is now a bit rusty, it didn't take much to trigger an alarm if the beams weren't where they were supposed to be.
Black helicopters don't need no stinking ILS.