Our router is on the groundfloor close to the phone socket, it's a BT Voyager 2110. The wireless signal downstairs is great, on the 1st floor it's ok, but if you are watching say BBC iplayer it can break up a bit. However on the 2nd floor which is a loft conversion it's not good at all, you usually have to walk around till you get a signal then it will suddenly drop you.
I know you can buy a booster, but I hav'nt a clue what to look for!! Anyone use one? Do they make a difference? Any ideas where I can get one and for what cost?