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When shopping for WiFi cards, consider and compare the sensitivity and output power range among the available cards on the market.
Look for sensitivity in the high 80 to low 90 range. On output power, most cards hover in the 14dBm to 17dBm range. Some manufacturers like SMC make cards with a 20 to 23dBm output power. Remember, the better the sensitivity the better it can pick up signals; the better the dBm value the farther it will transmit.
Some cards have built-in antennas and jacks for adding an external antenna. Adding an external antenna can improve the radiation pattern of the card. (If you are a tinkerer, you can find plans on the Web for building your own Wave Guide antenna using a Pringle or Coffee can.)
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