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The Yagi was first widely used during World War II for airborne radar sets, because of its simplicity and directionality. Ironically, many Japanese radar engineers were unaware of the design until very late in the war, due to inter-branch fighting between the Army and Navy. Arrays can be seen on the nose cones of many WWII aircraft, notably some versions of the German Junkers Ju 88 fighter-bomber and the British Bristol Beaufighter night-fighter and Short Sunderland flying-boat. Indeed, the latter had so many antennae elements arranged on its back it was nicknamed the "Flying Porcupine" by German airmen.