A. high gain antenna
B. omni directional antenna
C. unidirectional antenna
D. low gain antenna
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These antennas have a donut-shaped elevation pattern, which means they radiate equal power in all directions in the azimuth plane. The radiation pattern of an antenna is measured by traversing the entire x-y plane around the antenna under test. The beamwidth of an antenna or the 3 dB beam width of the antenna is termed as half null beam width.