Link: http://ubuntuforums.org/showthread.php?p=8255018

Comandos:

sudo apt-get install build-essential libssl-dev
sudo apt-get install linux-headers-`uname -r`
sudo apt-get install subversion
sudo -i
sudo svn checkout http://svn.madwifi-project.org/madwifi/trunk/ madwifi-ng
cd madwifi-ng
echo "" >> /etc/modprobe.d/blacklist
echo "#Remove To Install MadWIFI Drivers" >> /etc/modprobe.d/blacklist
echo "blacklist ath9k" >> /etc/modprobe.d/blacklist
make && make install
echo ath_pci >> /etc/modules