Primarily, you would be looking for an antenna with 3dbi gain through to 6-6.5dBi gain, depending on the environment and intended use. The 3dBi antenna has a wide pattern, ideal for undulating terrain. 6-6.5dBi antennas are popular due to their performance over distance on flatter or slightly uneven terrain. Higher gain, 9dBi antennas have a flatter and longer radiation pattern, more suited to distance on level terrain.
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