Passive radar, anyone?

[StSanta]

Uh oh
 http://abcnews.go.com/sections/world/DailyNews/radar_stealth_010614.html

Looks like future jet sims will be <flying along BOOM>

Oopd

[Sandman]

Hehe... someone at ABC understands bi-static radar.  

Here's a better article at the Journal of Electonic Defense. (registration required) The article concerns AEW platforms, but with continued miniaturization, a fighter should be able to use it as well.
 http://www.jedonline.com/jed/html/new/sep00/cover.html