WiFi receiver


In the zone
I have the TP-Link 3420 USB wifi router. I use wifi via 3g dongle in the house. Now i need a device for receiving wifi on my desktop. There are no free slots available so cant get a receiver card, insted i am liiking for usb options. Please suggest good wifi receiver for my pc.
Is this a good option LINK or there are better ones out there :)

Thanks :)
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