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There must be someone you know who has a small digital TV that you can borrow for a couple of hours, or you may even have an old set-top box that would do the trick too.
Set the borrowed TV up where your TV currently is. If it does the same, the problem is with the reception. Or set up the Set-top box, and feed its output into your TV's AV or HDMI input, and see whether or not it does the same.
Regards,
Renato
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