PURPOSE: A horizontal beam correcting method of an omni directional antenna and a horizontal beam correcting device are provided to reduce the performance deterioration of an antenna by correcting a radiation direction of the antenna based on a slope of the antenna based on a horizontal surface. CONSTITUTION: A gravity value of each shaft is obtained by using a tilt sensor(301). A slope of the antenna is calculated by using the gravity value of each shaft(302). A switch control signal is generated based on the slope of the antenna(303). A radiation direction of the antenna is corrected according to the switch control signal(304).
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