What frequencies do radar use?

Most radars, in practice, operate between 400 MHz to 36 GHz ; however, there are some notable exceptions. The optical and radio portions of the electromagnetic spectrum occupy positions coincidental with two important transparent bands in the Earth’s atmosphere and ionosphere.

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What does a radar do in war?

Radar, which is essentially “seeing” with radio waves, found dozens of other uses in the war. It was used to aim searchlights, then to aim anti-aircraft guns . It was put on ships, where it was used to navigate at night and through fog, to locate enemy ships and aircraft, and to direct gunfire.

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