There is provided a radar reflector apparatus that is mounted in a lifeboat or a small rescue boat or in a floating buoy used for salvage or search practice, or is used by itself independently, to serve as a radar wave reflector of a search rada r. The radar reflector apparatus has a simple structure, and is folded when not in use, a nd when used, is unfolded automatically when dropped by a marine vessel or aircraft or the like.
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