How is the best way to install a tv ariel and to split off into 3 bedrooms?

TV Ariel via coax cable to a Distribution unit (usually in the loft), these are often 4 way or above, then a seperate coax cable from the Distribution to each of the TV's.

Something like this; http://www.tvaerials.com/product.asp...ibution%20Unit

Thanks for that, we had someone round who said we would need 3 seperate ariels which didn't sound right to us.

Their are many cowboys in this trade, sounds like you had one Ye-Ha