The website Inverse has an interesting article on Amateur Radio direction finding:
Radio direction finding has existed for nearly as long as radio itself (the late 19th century). The military uses it for practical reasons, utilizing it to 'triangulate,' or locate, hidden military bases, transmitters, and submarines that would otherwise be a secret. (The basic technique, with different technological adaptations, was used in both World War I and World War II.) Now, radio direction finding has become a sport that combines the geeky charm of ham radio, the outdoor skills of orienteering, and the endurance of cross country.
Bob Frey is an ARDF athlete who has competed since 1999
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