http://www.argos.co.uk/static/Produc...er/5342000.htm
There's a vestion with a booster but I'd suggest that you get a decent standalone one, Argos have / had a SLX one with a 14 dB gain (after subtracting the noise) which is quite good.
You need a decent inbound signal before boosting though. I have this aerial here, running my TV card and STB off a single booster then an active splitter. No probs.