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An unterminated coax reflects the signal back into the splitter. This adds a source of short-path multipath interference that the connected tuners will need to deal with.
Best practice is to terminate unused ports. That can be done at the splitter or at the far end of the cable. I would opt to place the terminator at the coax wall jack if you anticipate using the jack at some point... save the trip back under the house.
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