30 feet away isn't too bad, but if the cable is old, or the connections aren't that great then it's fuzz city.
3 televisions? On the same line? I'd definately split that mama where it enters the house and run three seperate cables from there. At the very least, cabling, new splitter and some assorted odds and ends is going to be substantially less than a booster, which, from a cursory search only, looked to run somewhere in the $100 range.
Good luck and let us know how it works out.
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