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Directional vs. Omnidirectional antennas: The above image is not a precise scientific comparison drawing, but an illustration to show how the two antenna types compare. Omni-directional antennas can detect signals from multiple directions because gain is concentrated in a 360-degree horizontal pattern. They work best when you are mobile and do not know where signals are originating. Directional antennas concentrate gain in a particular direction. As our graphic above illustrates, each antenna type has an advantage over the other. That is why it is best to have each type, so you can use the antenna that is best for your particular needs. Because directional antennas work best in the direction they are pointed, in many cases, you will detect more signals overall with your omnidirectional antenna, but find that your directional antenna may get stronger signal strength to signals at which it is aimed. Directional antennas help reduce noise/interference because they are not picking up signals strongly from other directions.
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