So many lion users have been having problems with airport having to turn wifi on and off every 5 minutes just for a short burst of wifi. The reason: the Atheros wifi chip inside of your mac becomes updated as you update the OS. In the lion OS, there is a glitch in the coding of the chip. If you head over HERE you will find a link at the bottom of the post to install v3.2 Atheros Wi-Fi driver from Snow Leopard, to use on Lion. To install, simply unzip, open the folder, double click to install the zip file inside which will bring an app called kext utility out. Drag IO80211Family.kext onto the Kext Utility app and wait till the command line to finish and WO-LA, fixed internets!!
The only problem is that AirDrop does not have support as this KEXT is from Snow Leopard where AirDrop was not present.
Click HERE for a helpful video tutorial explaining the short process… (Video not by me!)
Thanks for reading!