I do this all the time with urtw0. do it like this without the quotes "sudo ifconfig urtw0 scan" --> should get you a list of nwid's ( net work id's ) that the radio in the usb wifi nic is picking up. usually they're public at places like Borders, McDonalds, Taco Bell, etc. If you ain't got a nwid you ain't gonna get nowhere -- that's been my luck. you have to have a nwid or if it's hidden who knows I don't go there anyway.
then with the nwid do this "sudo ifconfig urtw0 nwid "theNameOfTheAccessPoint" -chan up" --> that's about it. give it 30 seconds to connect fully. the dash chan tells the urtw0 driver to automatically pick a channel that's gonna work. don't make things harder than they have to be. the light should light up on your usb stick wifi thingy. then, do the "sudo dhclient urtw0" and get a lease and then rock out. hope this helps.
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