Question Pool -- Category E2C

What does a "Maidenhead" grid square refer to?
A.
A two-degree longitude by one degree latitude square, as part of a world wide numbering system
B.
A one-degree longitude by one degree latitude square, beginning at the South Pole
C.
An antenna made of wire grid used to amplify low-angle incoming signals while reducing high-angle incoming signals
D.
An antenna consisting of a screen or grid positioned directly beneath the radiating element

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