[yobeano]

Just a thought. If you don't find any hardware problem and it seems that it really is just a bad spot in your house then you could still use an access point. That is a device that looks kinda like a wireless router but is WIRED or PLUGGED into one of the ports on your router then placed close or closer to your problem area. It has an antenna on it and acts like a wireless extension of your router. It will become another wireless reception point for your devices. That is sort of the short story, might help in your case.