what is your pic like at the moment???

would deffo say with 7-8 tv's you would need a booster / splitter .. put it as close to the tv ariel as possible that way you wont amplify any crap that you pick up (loft normally is ok) bit bufty (good for you then )
http://www.maplin.co.uk/Module.aspx?...9416&doy=11m11