Our house is all wood construction. Signals from the top-floor closet, where the router currently lives, already make it to the downstairs far corner, but they're not very good. I'm modestly confident that a high quality AP placed in a central location can work here -- the stairs from the ground to 2nd floor are wide open, so an AP on the ceiling would have at most one wall between itself and the bulk of the house. I don't know which vendor makes the "best" AP, but if I'm going to be running a cable through the attic and cutting a hole in the ceiling, I don't mind spending the extra bucks to "do it right". Once.