What is the dBi value of AC68U Antenna ???

3 days ago i tried the super power antennas just to see what difference they are going to impact .

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

Super power antennas are 9 dBi and they provided me with the same strength and range of the stock one's .

just wondering What is the dBi value of AC68U Antenna ???