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Since you're using an old dish mount, I'm going to speculate that you are likely also using the old dish cabling. DISH usually uses multi-switches which look like but function differently from splitters. These multi-switches must be removed and bypassed as they will block all antenna signals.
Your best bet is to always build the system in stages. One antenna, one temporary coax cable going to one digital-capable TV set. Make that work to the greatest extent possible, then add the next component. Continue until it's complete
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