Connect to wifi channels above 11

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http://crunchbang.org – Hello everybody, i've been using crunchbang for about a week now and it's great but i found a issue, hope you guys could help me with, i can't connect to channels above 11 (they're legal in my country), i have tried installing the drivers for my wireless card ( rt3090) and that didn't solve the problem, can't control what channel is going to be used because that's the admin's decision and most of the time the channel 13 is being used and i wouldn't like going back to win7 for this.Thanks in advancesorry for the bad english. (HowTos)