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Gain measures an antenna's ability to amplify incoming signals. In other words, the gain value directly determines the antenna's receiving strength. Gain is measured in dB (decibels), and is a function of the antenna's capture area and reception/transmission frequency. Larger antennas with greater capture area generally have higher gain values, as do ones operating at higher frequencies.
For wide-area networks, where data transmission occur across a long-distance area, you will need an antenna with a high gain rating ( > 10 ). If the data transmission area for the antenna is in a small room, then a lower gain antenna will suffice.
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