Spliter box about £6,
Booster is no good will only boost a bad signal eg more noise etc,
Fitted aerial myself and run cables, all the kit can be bought from screwfix. fitted one aerial and linked this to a 6 port spliter using 'f' connectors then ran 3 cables to various rooms.(some took more time than others) signal strength very good, hardest bit is getting the aerial to pick up best signal, but with trial and error you can do it, total cost less than £100,