My internet cable comes in through an office above my garage. I bought an Airport Extreme in mid-fall 2011, hoping to get better range than my previous router, and I do, but still ... it's lacking in certain parts of the house. (Also, sidenote, wifi does not work well when the microwave is on!) Does anyone have tips on how to extend the range? I had a signal repeater downstairs long ago for the old setup ... do these even work?