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You would be better off trying an inexpensive rabbit-ear style indoor antenna.
The problem with using your power line wiring as an antenna is that you typically have many other noise generating devises attached to the power system, you would be inviting all that interference to have it's way with the reliability of reception. Then, if there is a fault that causes current in the ground conductor of the home wiring, there may be voltage present on the switch cover screws... how much voltage depends on the impedance of the grounding conductor and the magnitude of the fault current. So, there would be some small chance of damage to your TV.
As an aside, the experience of the YT post demonstrates that the power line ground is rarely if ever an effective RF ground.
In the end, I'll stick with the recommendation teleview and I offered early on in this thread.
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