ALFA Networks AWUS036NHR - Adjust TX power / PowerControl driver
To adjust and control the transmission power of the ALFA Network AWUS036NHR WiFi USB Adapter, simply install the "Power Control" driver from ALFA. After installation, the options "TX Power" and "Adjust TX Power" will be available (adjust = configure). Through these options, you can set the transmission power and utilize the full potential of the adapter.
You can find the driver here:
http://sourceforge.net/projects/alfanetwork/files/Driver/036NHR_PWRC.zip/download