I really liked this one.
If anyone have one of this network analyzers and do not use it – you can donate it 
Info says :
How to make a WIFI antenna which can be adjusted for best standing wave ratio
from WLAN channel 1 to channel 11
And link to a video :
Ubiquiti presented new line of devices for InnerFeed AirgirdM for 2.4gz band and NanoBridgeM for2.4 and 5gz UNII band.
AirGirdM is presented as complete airmax CPE Solutions for around $30USD – great price if you ask me! This one is succsesor of Bullet2M and promise up to 100MB throughput so no real MIMO here.
Next thing is NanoBridgeM : the first true cost-effective MIMO bridging device. Up to 150MB airmax throughput.
What more to say must make and test this antenna.
link to the site : http://www.zero13wireless.net/foro/showthread.php?t=7313
Please if You know the model of this antenna contact me.
15 dbi wifi panel antenna