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How are you pointing the old antenna? Does it have a UHF element on it or just VHF? I used to think you pointed those the way the "arrow" shape looks, it's actually backwards. Point the "arrow" away from the direction.
Also what kind of cable is connected to the antenna? Old broken cable or the RF modulator can be bad causing no signal.
Sometimes you can bring those old systems back to life, but many times it's better to pull it all out and replace with known good, new stuff.
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