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Are you stuck on leaving the antenna in the attic? I would try moving the antenna to the roof temporarily to see if reception improves. Attics are a poor place to site an antenna, typically, and only workable if the TV signals are strong to begin with.
A preamp at the antenna can help with weak signals that do not have the strength at the antenna to make it through whatever cable run and splitters you have. The amplifier actually reduces the quality of the signal at the antenna by adding some noise of its own - but often that is a worthwhile trade for the higher signal amplitude, especially with long cable runs and splitters. The splitter cuts the signal strength in half, but does not add a lot of noise. You could try running the short cable directly to the nearest TV and see if you get any more stations - that would give you an indication if adding an amplifier at the antenna would be helpful.
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