Ok my problem is I have a awus050nh with the rt2800usb driver in backtrack 4 and it works fine in 2.4 ghz on aireplay-ng and kismet everything works but when i put it in 5.8 ghz with "airodump-ng --band a wlan0" shows me different ap that's ok but in the ap I know they have wep encrytion airodump show me that they have wpa and cypher wep and that is a error. I scan in windows and this ap really have wep protection and I scan in my ubiquiti ns5 and show me that ap have wep protection.