It's still a game of cat and mouse, because the operators either will have enough sources not to care or be clever enough to only paint a target at the last moment.

Anti-radiation missiles seem fun to work on, for example the (now retired) ALARM missile will loiter at 13 km with a parachute then use a secondary rocket motor to attack a target it finds. The signal processing these things do is probably unbelievable.

Thinking about it some more, a radar altimeter is only effective to ~2000 feet so it’s probably going to be a relatively close range highly-directional beam which would make it harder for a seeker head to find but also means you’d need a truck close to the airfield perimeter, painting aircraft on final approach.

WRT last minute painting, I guess the E model would help a bit with that:

> the AGM-88E Advanced Antiradiation Guided Missile (AARGM), features the latest software, enhanced capabilities intended to counter enemy radar shutdown

At 870k USD a pop you wouldn’t want to be lobbing a lot of them, though - as you say, it’s going to cheaper to build jammers than countermeasures to destroy them.