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Which of the following statements about antenna gain are true?

Which of the following statements about antenna gain are true?

A.

When selecting the antenna gain, ensure that the beam matches the coverage area. If the coverage distance is small, select low-gain antennas with wide vertical lobes to ensure the coverage effect in the area near the antenna.

B.

An antenna's gain quantitatively measures the degree of input power an antenna can radiate in a given direction.

C.

An antenna's gain measures its ability to transmit and receive signals in a specific direction. It is irrelevant to the antenna model.

D.

Antennas are passive components, and they do not amplify electromagnetic signals.

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