ass (the only appropriate word in your title :-)
"standard radar measures impulses returned"
The so called 'invisible radar" doesn't rely on traditional radar transmissions.
Cybermace5 knows his stuff on this topic. Read him again.
Now go back to sleep (you must be sleep posting :-)
Cheers Doug
Spectres from our past: Beware the future when your children & theirs come after you for what you may have been willing to condone today - dsm 2003
Motivational: When performing activities, ask yourself if the person you most want to be would do, or say, it - dsm 2003