If your cables split off to the various locations in your house from the attic, you have a couple of choices. It's expensive to add AC power where it isn't present: You COULD add an AC outlet in the attic, but a better solution would be to buy a power-passive splitter, one that passes DC power, install that splitter in the attic, then mount the power injector in the cable line at either TV set, where AC power is already available. DC power-passive splitters cost only a couple of dollars more than regular splitters, and will save you the cost of running AC power to the attic.
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