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E2C05

What does a Maidenhead gridsquare refer to?

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AAn antenna consisting of a screen or grid positioned directly beneath the radiating element
BAn antenna made of wire grid used to amplify low-angle incoming signals while reducing high-angle incoming signals
CA one-degree longitude by one degree latitude square, beginning at the South Pole
DA two-degree longitude by one-degree latitude square, as part of a world wide numbering system