Which of the following factors should be considered when engineers determine the antenna installation height in the long-distance point-to-point scenario? (Multiple Choice)

Which of the following factors should be considered when engineers determine the antenna installation height in the long-distance point-to-point scenario? (Multiple Choice)
A . Signal transmission frequency
B . Distance between the receive and transmit antennas
C . Antenna beamwidth
D . Earth curvature

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Answer: ABD