>>367908574
Firstly, don't been seen. Use terrain to hide yourself from the radar emitter, and use anti-radiation missiles to destroy them before moving back up to high altitude. Before long-rang air defenses are destroyed you should fly very low. If you go to the ARAD MFD page on the F26 or AV42 you can turn on HUD display of radar emitters and this helps a lot for situational awareness. 

Secondly, don't be engaged. LISTEN TO YOUR RWR, and use the wiki to find out what each type of emitter is. When you get a radar lock warning (rapid tone, circle around the emitter) then it is trying to engage you and you should take action. Probably it has sent out a semi-active radar missile that is already on it's way to you. This means that the launch site must guide the missile close enough to you for it's own seeker to activate- so you're only going to get the actual "MISSILE" alert when this gets very close, and that's dangerous.