Hi !

My mind is to buy TP-LINK WN321G USB WiFi Adapter for cracking wifi's.
I wonder if there is someone who is using this adapter too in order to give me some opinions about:
1.Is it a good wifi usb adaptor ?
2.What is the perimeter area covered by this adapter ?
3.Its signal will go outside the room or i should go outside the room in order to catch some signals ? (I know this sounds stupid but this is what a vendor said to me about this card: that it is possible to not catch any signal if i am in my room).

Thanks !