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Interference can be radiated or conducted by the power line or both. The shielding in the attic would help to reduce the radiated interference, but it might be coming in to the TV over the power line.
Is the coax grounded with a grounding block that is connected to the house electrical system ground?
It is often necessary to block the interference at the device causing the interference with an AC line filter if it is being conducted over the power line.
Interference problems can be difficult to solve, especially if channel 39 is weak.
Last edited by rabbit73; 1-Aug-2017 at 12:47 AM.
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