Omni directional antenna is 1 antenna the antenna Point-to-Multipoint this is a half-sphere RADIUS is above the ground from the Center up the signal sent from the antenna, it will have a radical and relatively weak signals are often used to address receiver in the radial distance students will have a radius of no more than 100 meters, made from a central pillar. The advantage of this is that the contract can be sent freely.
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