Satellite television installations are often very sloppy. I'd start by checking all the connections throughout the system.
Also, did you replace the splitter? Typically the ones used for satellite television are not spec'd for OTA television.
A standard debug method would be to follow the lead from the attic antenna into the house. At the first break in the coax connect it to a television and see what you get. Then move slowly throughout the system to see where you are loosing signal.
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