I live in a 2 story + basement apartment home. I keep my AEBS in the basement. Machines include two 11n laptops, one 11n desktop one 11b AEX. I get perfect reception an all corners of all floors. However, when I go to the backyard, literally 15 feet from the router, I get almost no reception (one bar that comes and goes). Any idea why this would be the case? Is there some sort of directional setting I can change?