Question about open network and Airport

Hi,
in my school there is a open network that allows me to surf the web with my MacBook, but my room has a very bad location so for me to connect to the network I have to put my MacBook in the window of the room. I always try to connect from inside the room but I don't have signal available. My question is: can I use some sort of Airport extreme, express or generic Wireless Router to capture the signal in the window and then send it to the inside of my room??? Any suggestions, websites? I have no access to the router (no admin access to configure).
Thanks!
PS: Sorry, english it's not my first language (writing from Chile)...
Best,
AUP

Do you need to be wireless in your room?
If not then an ethernet wireless bridge would be a possibility such as the Linksys WET54G.
If you want to be wireless you could use a Linksys WET54G to pick up the signal from the Window and then connect a wireless access point (such as the Airport Express or any cheap 802.11g wireless access point) to the WET54G for wireless access.
iFelix

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