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It sounds like a Channel Master Advantage series:either a 3018 or a 3020. A picture would confirm that. If it's 10 years old, chances are good that it is corroded, and is likely not optimized for the stations that are currently available. Since channel 12 is not coming in, and, based on your TVFool.com scan, it should be, my first guess would be to replace the antenna and add a rotator. My best suggestion would be to go with a separate VHF high-band yagi like a Winegard YA-1713 for channel 12, and use an AntennasDirect XG-91 mounted 4' above the YA-1713 . Connect the two antennas using an antenna JOINER like the Pico-Macom UVSJ; NOT a simple splitter. While several combination antennas can equal the VHF performance of the YA-1713, none can equal the UHF capability of the AntennasDirect XG-91. By using a rotator, you should be able to see a few stations that would otherwise be out of the view of a fixed antenna system. I recommend using either a Channel Master 9521a or an Antennacraft TDP-2 fotator with the optional TB-105 support bearing for this purpose.
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