Eh, you probably have to have access to the router for that. I'd get this - I used it back home when my parents had shitty internet to get internet from a block away.

Some examples I've looked at: https://www.amazon.ca/Alfa-802-11g-OMNI-Directional-High-Gain-Adapters/dp/B002TWEKD0/ref=sr_1_8?ie=UTF8&qid=1313511218&sr=8-8

http://www.amazon.com/Alfa-802-11b-Wireless-Original-9dBi/dp/B001O9X9EU/ref=sr_1_3?ie=UTF8&qid=1312547880&sr=8-3