External Antennas
If you can establish a reliable high-speed data link to any location in your network's coverage area with the antennas built into your network adapters and the captive antennas attached to your access points, there is absolutely no reason to waste any time, money, or energy on external antennas. When you reach the maximum possible speed, better antennas won't move the data any faster.
But when reception conditions are less than perfect, and when you want to push a radio signal as far as you possibly can, a separate antenna can cut through interference, increase data transfer speed, expand the network's coverage area, and establish reliable communication links in places where they would be little more than a rumor if you use adapters ...
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