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Thanks for checking back in with us.
It sounds as if the actual preamplifier (the box on the mast near the antenna) failed. Any number of reasons may account for that. (Nearby lighting, power surge, etc.)
There are several good preamplifiers, I'd suggest an Antennas Direct CPA-19. It has better noise specifications and is more resistant to overload.
Regardless of which preamplifier you choose, remove the old power supply. That's the part inside the house near your TV. The new preamplifier kit will come with it's own power supply parts which are not guarantied to be compatible with the old preamplifier parts.
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