This package contains patches for txpower adjustment of the well 
known hostap driver included on linux kernels >= linux-2.6.14.x. 
The code has been ported from the old driver and tested for
stability with very good results.

The reason that it's not on the main driver is that it needs a
specific firmware which is also included in this package.

HowTo Install:

cd /tmp
tar xvfz hostap-kernel-txpower.tar.gz
cd /usr/src/linux/drivers/net/wireless/hostap/
cat /tmp/hostap-kernel-txpower/hostap-kernel-txpower-patch.diff | patch -p1

before using the txpower command, you need to first load the provided
firmware like this: . /etc/firmware/firmware.sh

the value range goes from 127 which is for lowest RF output to -127
for the highest RF output. You may check the following chart for
more details about the txpower settings:

http://wifi.ozo.com/images/txpower-graph.jpg

tested on production systems and it works quite well as long as 
you use the included firmware.

Disclaimer: ** USE it at your own risk !!! ***