How can I extend the range of a wireless router?

My girlfrind has a wireless Linksks router in her office that has a range of 300 feet.
I need to extend it's range to at least 700 feet.
Is there any kind of hardware out there that would extend its range to at least 700 feet?
Don't know where to turn

 

http://www.linksys.com/servlet/Sate...578138&pagename=Linksys/Common/VisitorWrapper

http://www.linksys.com/servlet/Sate...829339&pagename=Linksys/Common/VisitorWrapper

 

Thank You splitt3r
Very good of you to help with your direction.
I learned that I need a WPC54gX card for my laptop to receive the signal.
Is there a better card I can use with a Linsys Extender?
Thanks again Britany

 

no problem, glad to help. I am not sure about the network card but I think this is the best you can get.

http://www.linksys.com/servlet/Sate...827132&pagename=Linksys/Common/VisitorWrapper

 

Thanks again.
Have a Happy New Year!
Britany