I have no idea what speed silver AOL is, but it's probably either 4mbps or 2mbps. Either way, about the fastest you can realistically get in the UK so far is about 8mbps.
With network connections (or really any sort of connections), it's only as fast as the slowest speed. So your 54mbps connection is thus probably about 50mbps faster than your actual internet, so is perfectly adequate. But it'll still only run at about 4mbps or whatever yours is.
Since it's broadband over your phone line, I assume you have a USB modem. In which case, get a wireless router+modem in one. Something like this:
http://www.ebuyer.com/UK/product/52244