Luxury! I dream of a house so big that two wifi networks still can't reach all of it! I don't know the technicalities, but is there some sort of relay device that would extend the range?
[rab] What a nice thing to say. [pen] Depends on the character of the problem. If I were in a big old house with thick old building materials I'd consider powerline adapter/access points, which would obviate the wiring problem and the signal-blocking walls problem and let you put wifi whereever you need it. It's also worth looking at whether the access points you have are up-to-date, as powerful/sensitive as they might be and reasonably sited to where you actually want them, and move/replace as appropriate. I just put in this model, originally intending to mount it in the ceiling central to the house -- there are generally fewer things to get in the way and absorb signal higher up -- but as it's a bungalow it's reaching everything quite well just sitting on a desk in the basement. What's nice about this one is that it projects signal in all directions including above and below, so it's ideal for placing in a ground floor ceiling of a two storey house. But again, I don't know what exactly what problem we're solving here.