Region : Argentina

Model : TL-WN722N

Hardware Version : Not Clear

Firmware Version :

ISP :

(My Region is Pakistan , Kindly add it in Region List)

Yesterday i Bought TP-Link TL-wn722n Usb Wifi Adapter. So , The Problem is When i Connect it Without Antenna it Don't Detect any Wifi ( i 'm Only 5 feet Away From my Router) .
And When i Connect it's 4dbi Antenna With it then it Detect My Wifi but hardly Giving 2,3 Signal Bars.
So my Question is That Is Something Wrong With my Device Range . Or They Don't Have High Range??? (Product Spec says That it's High Gain Adapter). :(
And Another Thing i want To ask is That , is Such Wifi Adapter Don't Work Without Antenna or They Are not Meant To Be Work Without Antenna??? (i Thought Without antenna they also Capture Wifi) :confused:
(Please Answer all Of My Questions)