[John Candle]

Sounds like you have the cable tv and the antenna connected together and then not connected and then connected and then not connected and etc.. I suggest you arrive at a understanding of how the coaxial wiring is run. Is the coax run as , loop , home run , or combination of both? . Do Not connect both the Tv antenna and the Active cable tv at the same time on the same coax. . Loop type wiring is also known as daisy chain.