I have a similar model to you. Here is what you need.
First disable Atheros Hardware Access Layer [HAL]:
Go to System>Administration>Hardware Drivers and uncheck Atheros Hardware Access Layer then reboot.
This will download the drivers.
Code:
wget http://snapshots.madwifi.org/special/madwifi-nr-r3366+ar5007.tar.gz
Then untar it. And open it.
Code:
tar xfz madwifi-nr-r3366+ar5007.tar.gz
cd madwifi-nr-r3366+ar5007
Then compile the C files.
Then install them.
Then you want wifi to start every time you boot.
Code:
sudo gedit /etc/modules
KEEP THE STUFF THAT IS ALREADY THERE and add this line.
Code:
#Wifi Driver
modprobe ath_pci
Then reboot
Bookmarks