Lets get back to business. Its a long time with nothing interesting about wifi antennas.
This one is samll wifi antenna from my old zyxel router. It works great and finally I have some good pictures of it thanks to my friend from ONEBG
This antenna is little different from other 5 dbi antennas I used it give me more ssids when I scan and may be it give me more than the 5dbi it promises.
This one is one from the antennas I use.
I have 4 or 5 of them and finally I have one free to tear apart.
Price was ~ 25 euros before 2 3 years.
They promised me 12 dbi and 120 degrees but diagram is more like 90 100 degrees.
Interesting pattern are found on the pcb board 
– it worked for me so there is no mater how it madded .
A new product from Ubiquiti we may see soon.
I defiantly will have one of these
Breakthrough Price/Performance Spectrum Analyzer for the Masses
ubiquitis-airview Spectrum Analyzer
Ubiquiti’s Airview is a revolutionary product which consists of a tiny USB module, that when paired with a common laptop or PC, transforms into a powerful Spectrum Analyzer at a market breakthrough $39 USD MSRP price point.
Airview is available in four different models:
More info http://www.ubnt.com/airview/
And DEMO page here : http://www.ubnt.com/airview/demo/