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Presuming the 7" RCA TV is equipped with a digital tuner, I have to presume you will need to perform a channel scan each time you reposition the antenna. However, it's best that you check the manual for that TV...
Most TVs with ATSC tuners will not accept direct manual tuning, or simply sweeping the horizon with the antenna... Some will accept direct entry but only through the menu (manual add mode). Again, what does the manual say?
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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