Why?!

Why is it that I can get onto the internet from anywhere in the house except from 6 feet away from the router on the love seat? I can move 5 more feet away to the far side of the couch and it works fine. I can go to other rooms and it works fine. I just can't use it unless I put it within point blank range if I want to sit in my favorite computing spot. I can't even blame it on interference from other electronic equipment because I'm usually all by myself when I get online so the TV is off and nothing else is running. I just don't get it.