Adcock antenna

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An antenna consisting of a pair of horizontally spaced vertical elements connected, or coupled, differentially to a single output circuit and designed to minimise the response to the horizontally polarized electric component of the field, the response pattern having the shape of a figure of eight.

Reference: BCentre of buoyancy.SSouth. (modified)

Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)