1. the antenna (Omni Directional Antenna) around the antenna of this type are the wave propagation direction, 360-degree surround, suitable for use in contact with a client that is in motion and direction. 2. the direction of the antenna (Directional Antenna) is an antenna with the direction of the waves has a clear direction. Suitable for contact between the points. Unable to add mileage to shutting beyond the antenna around, but there are disadvantages, if not in the wave propagation direction, and will not be able to get a contract, usually a product ID.
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