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In page Hawker Typhoon:

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In late 1943, Mk III IFF replaced the Mk I and the tailplane tip to fuselage Identification friend or foe (IFF) aerials were replaced by a "bayonet" aerial under the wing's centre section. A Beam Approach Beacon System (Rebecca) transponder unit was fitted in 1944, with the associated aerial appearing under the centre section.[citation needed]