Have you tried placing the antenna at a north facing window? If there is sheet metal covering the roof deck, the attic is a poor location for any antenna.
Have you tried swapping the two TVs as a test? If there is a difference in tuner quality and no problem with the cables and connections, the poor tuner will perform about the same in both locations.
Last edited by GroundUrMast; 7-Sep-2012 at 6:40 AM.
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