Originally Posted by terminator2k2

some tvs do supply 5v to the aerial....which is switchable by one of the menus....not all tvs have this function......it is used to supply a masthead amplifier if ur using one instead of using a seperate power supply.....

as for splitting the signal u really need a proper meter to see wats really going on....but what i would do is firstly buy something like a f splitter and see if its ok.....if not just buy a distribution amp..... depending on how many outputs u want....