He wasn't worried about ground radars - the plane containing no metal was absolutely invisible to them.

For references regarding ground radar, see the specific article.

Several patrols are on the move all night long, well away from the battalion, and ground radar watches avenues of approach.

He has studied their flight tactics, tracking them from his glider and with ground radar.

"You really are that tied to your ground radar?"

They use ground radar and their eyes to keep track of what is where.

Interference is not that common between ground radars, however, because they are not usually placed close enough together.

Fixed ground radar is used to detect birds flying near aircraft.

In addition, neither of the aircraft could be seen from the control tower, and the airport was not equipped with ground radar.

It is the most common ground radar in China, and is rapidly being exported to other countries.