A:Answer Depends. If the signals in your area are strong, and if quality splitters are used and all TV inputs are reasonably sensitive, you could put ten TV's or more on the antenna. Some TV's have a signal metering function built in to help you. If so, you can look at each channel to see how many bars you get each. Then the best practical answer is to look at one TV signal metering function to get a base idea. If it's good, then buy some splitters and see how the divided signal fairs with more TV's attached. Think of it as like dividing a water hose to more and more sprinklers and losing a little oomph with too many.
Splitters usually come in a choice of 2, 3 or 4 terminals. It is best to split, in combination, to the exact number of TV's you plan to use since unused connections actually degrade the signal balance, almost like a hose leak. If the are any splitter terminals left over, you should be able to buy 75 ohm 'terminal' caps to screw on the few unused splitter terminals to correct this. If any signal line gets weak, it can be boosted, either on the input to any TV, or before any splitter, right off the main antenna lead. The splitters aren't too expensive and boosters are just a bit more. Still, these parts plus extra lead wires can exceed the antenna cost, if you need quite a few.