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G9C06

Which of the following is a reason why a Yagi antenna is often used for radio communications on the 20 meter band?

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AIt provides the highest possible angle of radiation for the HF bands
BIt helps reduce interference from other stations to the side or behind the antenna
CIt is smaller, less expensive and easier to erect than a dipole or vertical antenna
DIt provides excellent omnidirectional coverage in the horizontal plane