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How about the performance of the commonly used sho

Date:(2016-5-7)   Hits:1112
Directional antenna, simple bipolar antenna suitable for short distance communication, but the short wave distance communication signal is weak, and even when a variety of noise drowned, the antenna needs to choose a higher antenna gain than the bipolar. The ideal directional antenna has a high gain in the direction of operation and the gain is 0.
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