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Ways to increase range of our present wireless router [duplicate]

Possible Duplicate: What's the best way to increase the range of my 802.11g router? We are searching for a solution to increase the range of our present wireless solution. We are ...
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500 views

Is it possible to make a wifi g network link over 1-2km (1 mile) with some obstacles?

What type of antenna should I get ? Should I use an usb wifi dongle or a dd-wrt router for 2 laptops ?