Difference between antenna factor and antenna gain

There is some misunderstanding regarding the terms antenna factor and the antenna gain. Both the items are related to field but in a different way.

Antenna Factor

The antenna factor is specified in 1/m, and is added to the reading of the spectrum analyser, which is in dBuV. Both units are logarithmic so adding one factor to the other is the same as multiplying them in a linear scale. The resulting unit is the dBuV/m, the unit used for Radiated Emission testing. The factor is always related to a certain distance, be aware when using it. Some manufactures/calibration houses supply multiple factors, check which on applies to your set up. An often made mistake is the antenna factor for 10 meters in used in a 3 meter side or the other way around.

Antenna Gain

The antenna gain