Antenna factor measurement

I have to make a measurement on a wireless system, and set the output power so it is at a certain number of microvolts/meter at 3 meters. I do not have any calibrated antennas, but have lots of generic antennas in this frequency band. I heard there is a "3 antenna" measurement method to figure out the antenna factor. Can anyone explain how it is done?

This is a short explanation about Three-Antenna Gain Method

Thanks, dude.

read this also

PL