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There are many varieties of antennas for use under different conditions such as different frequencies, different uses, different occasions, and different requirements. According to different installation methods, it can be divided into built-in antenna and external antenna; according to different signal transmission directions, it can be divided into directional antenna and omnidirectional antenna; according to different frequencies, it can be divided into 2.4G antenna and 5.8G antenna... so much Antenna type, how to choose?
The external antenna is generally large. If the transmission distance is relatively long, for example, more than 10 kilometers, it is recommended to use a high-gain external antenna. Generally when multiple video signals are sent (point-to-multipoint) to transmit video signals, if you need to increase the receiving angle, you can use an external antenna to achieve this. Because the angle of the built-in antenna is relatively small, it is not suitable at this time.
That is, in the horizontal direction, it shows that the radiation is uniformly 360°. The radiation range is like an apple. It has non-directionality and is generally used in environments where the transmission distance is near and the coverage is large. Omnidirectional antenna signals are transmitted in all directions. The price is low and the gain is relatively small, generally less than 9 dBi.
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