If you need something with a good transmit power and sensitivity you should go and check something like the Awus036h (1000 mW) or the Awus036nh (2000 mW). You should also know that the most important thing for a long range wifi connexion is not only the wifi adapter itself, but also the antenna you use with it, and the required antenna to suit your needs is a directionnal one, you can use a yagi or a dish. With a good wifi card and a high gain directionnal antenna you can set up a wifi network with a good bandwith a few miles away.


