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If you need to split the signal, you are usually better off with passive splitters - that is "passive" because it does not use a power supply to amplify the signal. An amplifier is an "active" device. A passive splitter will reduce the signal amplitude, but does not add significant noise to the signal. Basically the splitter just divides the signal in half, or in three or four parts, and what comes out is half or a third or a fourth as strong.
If the splitter makes the signal too weak, it would be better to add a medium-gain preamp at the mast (right up next to the antenna), and amplify the signal before it is weakened by running through a long cable. Then use a passive splitter to divide this stronger signal.
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