Sounds like I've got the same sort of problem as you! This helped me out alot: http://www.microsoft.com/athome/setup/wirelesstips.aspx#fbid=JfJpuKZc3dH

I'm looking into getting a WiFi repeater myself as I am trying to boost the signal from my Xbox to our houses router which is on the other side of a thick wall. Does anyone have this and think it does the job or should I cough up more money and get something better: http://www.amazon.co.uk/Repeater-amplifier-including-connection-standards/dp/B006CKWZT6/ref=sr12?ie=UTF8&qid=1357326420&sr=8-2

ClareGardiner, your BT telephone line is split by the engineer who installed it into a telephone line and a broadband line at its entry point to the house. The broadband plug and socket are slightly different in shape to the telephone plugs and sockets.(ADSL is more or less the former name for what is Broadband - in the simplest terms!) A Repeater, usually plugged into an electrical socket merely receives the WiFi signal from your router and retransmits it (or boosts it) ideally you want to position it where it will still receive the WiFi signal from the router but also somewhere where it will transmit a good signal to the shop.