Help! In desperate need of advice on improving the quality of my wireless broadband. I live in a two-storey house that has no phone sockets upstairs. And upstairs is where my office is with my iMac. I also use my MacBook around the house, upstairs and down. My wireless router (ZyXEL Prestige 660HW-61) is in the hall downstairs but the signal is very inconsistent, ranging from quite good to so weak it's almost unusuable. I'm clueless about all of this so would be endlessly grateful if you fine and handsome experts could tell me if the AirPort Extreme Base Station could solve my problems? What I really don't understand is if the usefulness of the AirPort is dependent on my router having a reasonably strong and consistent signal - in other words, would it be a waste of money with the erratic set-up I currently have? Would really be grateful for any advice, many thanks.