If you mount the amplifier in a closet, the important cable length is 'from the antenna to the amplifier input'. Hopefully, you could find a location that needed a bit less than 30' of coax for that link. The cable from the amplifier output is not as significant, until cable and splitter loss are close to cancelling the gain of the amplifier.
As the others have suggested, the ideal installation would have the antenna free of all obstructions and the distribution cabling home run from a single distribution point... You may need to do some or all of that, but a compromised design that works... works.
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