G9C06 (C)
Which of the following is a reason why a Yagi antenna is often used for radio communications on the 20 meter band?
A. It provides excellent omnidirectional coverage in the horizontal plane
B. It is smaller, less expensive and easier to erect than a dipole or vertical antenna
C. It helps reduce interference from other stations to the side or behind the antenna
D. It provides the highest possible angle of radiation for the HF bands
