The listing, USB WIFI Adapter (b/g/n) - Free shipping if GIN is used has ended.
USB WIFI adapter with antenna.
It can pick up very good signal.
This will work with Windows, Linux or Mac.
You can replace the antenna with a more powerful one like these:
http://www.amazon.com/Booster-OMNI-Directional-High-Gain-Screw-On-magnetic/dp/tech-data/B0039ORBLK/ref=de_a_smtd
http://www.amazon.com/TP-LINK-TL-ANT2405C-Desktop-Omni-directional-Antenna/dp/B001VEAI74/ref=sr_1_7?ie=UTF8&qid=1369148097&sr=8-7&keywords=wifi+antenna
It will greatly boost your wifi signal. If you live in an apartment you will likely get a free wifi (I don't suggest you do it without your neighbors permission). :-)
Free shipping if GIN is used