This all depends. While its only 11mb, remember that NTL's top board band speed is only 1mb.
Also it depends on how much speed you need. If you’re planning on playing the latest games over your network (that’s to say NOT to the internet) then you may find you'll want something faster. Cable based networks will run from 100mb to even a 1gig. But if you still want to go wireless, then you can get an 802.11g standard networking kit. This is backward compatibly with the 11b standard (11Mb wireless) but the .11g networks work at 54Mb a second which is about 5 times faster than the .11b networks.
But it all depends on what your planning on using your network for.