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'''Radar''' (short for '''Ra'''dio '''D'''etection '''a'''nd '''R'''anging) is a [[radio]]-based method for detecting the existence of distant [[aircraft]].  The term was coined at the beginning of World War II.  Radar was useful to the Allies in detecting [[German]] bombers.

'''Radar''' (short for '''Ra'''dio '''D'''etection '''a'''nd '''R'''anging) is a [[radio]]-based method for detecting the existence of distant [[aircraft]].  The term was coined at the beginning of World War II.  Radar was invented by the British in the 1930s and put in place just in time to win the [[Battle of Britain]] in 1940 by spotting the exact location of fleets of [[Luftwaffe]] bombers and sending fighters to intercept them. .

Radar works by bouncing radio waves off distant objects (such as aircraft) and timing their reflection. Conventional radar uses wavelengths on the range 40mm-60mm.

Radar works by bouncing radio waves off distant objects (such as aircraft) and timing their reflection. Conventional radar uses wavelengths on the range 40mm-60mm.