Unlike omnidirectional anténnas, directionals must be aimed in the path of the transmission transmitter or receiver which can become for example a router or WiFi hotspot.A good method to begin without seeing actual lab information or understanding the specifications is to determine by thé dBi (decibel isótropic) ranking.The higher the dBi rating the narrower the reception cone and knowing these data points you can then start to filter down the correct antenna for you.As a rule of thumb to keep in mind, high dBi rating further range protected but not really area.
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