[Blueflag]

"stealth" aircraft are actually called low-observable for a reason. They have a small radar cross-section, but not a zero cross section. They are always seen by the radar, just not detected as aircraft.

Lockheed developed a system like the one described here some time ago-- used ambient and terrrestrial RF as the transmitter. Same thing works for super-advanced SONARS -- the systems listen for a moving hole in the background noise of the ocean. Makes it 'easy' to find "silent" subs if they move.

[RedBloodedAmerican]

B117 is deteced to be about the size of a seagull, if I am not mistaken.

[RedBloodedAmerican]

A very fast seagull.