But not so much with any recent generation anti-radar/radio missile, which remembers where it saw the radar last and heads there.
Lots of people are surprised by new technology.
Some, even by old technology.
I was actually just making a joke with my original post, but if you have to shut down your multi-million dollar aircraft defense system every time it detects an aircraft for fear that a HARM missile is going to go down its throat it would seem to reduce its effectiveness.