You could always get a wireless repeater. A repeater is like a wireless signal amplifier. It takes whatever wireless signal it can find, gives it more power and rebroadcasts it. it should make you have much better coverage throughout your entire house. Linksys makes one, I think you can usually find it on sale for around $80. Here is what you are looking for
http://www.linksys.com/products/prod...id=38&prid=629