Linksys router wont send signal far enough

[goheels]

I had a linksys 54G and it worked great until it went bad so I got another one just like it. It won't send a signal to my wife's computer which is through several interior walls about 50 feet from router. The one that went bad there was no problem. Is there a way to boost the signal.

 

[Pyree]

Get a bigger antenna.