Hi,
First of you have to check the Atenna connection in the rare of your tv. Check for any loose contact on the connection of the wire to the pin. may be its the cause for showing signal as 0%. you can confirm the same by connecting the tv at the place where you doughters tv is connected. If there you get the picture then there is some thing wrong with the atenna connection.
If want information how to tune your tv then need information like BRAND and MODEL NUMBER of you TV.
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