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Existing coax is fine - just ensure it's RG-6 and that it's not active with cable/internet services. If it's daisy chained, be sure put termination caps on any unused connections. If it's a direct run or a homerun, then you won't need to cap.
Personally I'd keep the tuner out of the attic, at least for now. See how it works first. Don't try to work around issues that don't actually exist! Your goal is to keep it as simple as possible. The great thing about an antenna setup is that you can easily add to it as necessary. Given it's a single connection and only about 25 ft, you shouldn't have a problem given the signals around you. But, it is an attic, so that will account for some loss.
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