Vertical plane
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Vertical plane is used in radio to plot a antenna's relative field strength (which directly affects a station's coverage area) on a polar graph.
Normally the maximum of 1.000 or 0 dB is at the side (unless there is beam tilt), which is labeled 0°, to 90° at the top and −90° at the bottom. Other field strengths are expressed as a decimal less than 1.000, a percentage less than 100%, or decibels less than 0 dB.
See also the perpendicular horizontal plane.