That's not a good antenna, and probably the source of your problems. Indoor reception is prone to lots of potential interference issues - lamps in your house, people moving around a room, trucks passing by outside, etc. Plus all the stuff that impacts outdoor antennas like weather conditions. Depending on your distance and topography, you may need to give serious consideration to an attic antenna or an outdoor antenna. And RCA's marketing "rating" isn't worth a hill of beans. You need Front-to-Back ratio and net gain numbers over a large number of channels to really compare antennas.
I do not gave an attic. At first the aerial worked perfectly. Then after an put two weeks the picture on the OTA stations looked weird at times.
Which is the best aerial that you would recommend.
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