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Well, you can always use the rule of thumb values for loss for a given splitter, length of run, etc. Then you can subtract all of that from your signal and figure if it's enough. Or you just hook it up and see how it goes. Nothing compares to the real deal.
What I'd suggest is that if you have a given reception on a single set, make note of signal strength on some of your channels - maybe best, middle, worst....or all if you like. Signal strength is usually on the TV's diagnostic menu; either bars, % or something. (At worst, you watch the channels after the fact and look for breakup.) Then do your hook up w/all four and see how the original TV fares. If you lose channels or signals are much weaker, then putting an amp inline probably brings it back for you. If all is well, then you may not need it...but I suspect you will. As said before, put an amp near the antenna for best performance; as near as possible means you strengthen good signal vs strengthen a weak signal. Same reason we put microphones as close to a sound source to amplify as clearly as possible.
If you didn't have an amp of some sort already, I think several posts here have made some good recommendations.
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