Those ant-in(or cable-in as yours says) are usually pass-throughs meant for a VCR or satellite without locals... That being said, I don't think it would be like having two times the antenna but really just pulling in a signal off of one or the other. If you're far away from towers you could always try amplified antennas if it's just poor reception the good ole tinfoil flags may do the trick.(may not be everyone's idea of good decorating though)
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