Advertisements So I have a lifetime series 3 and want to try cutting the cord from my cable provider. But I wanted to "stage it" and see how I liked it before formally ending my cable subscription. But it seems the unit won't let me use "both" at the same time. I get an error message saying it won't let me proceed. I'm getting the impression I have to remove my cable cards and only use the antenna. Is that correct? What am I doing wrong?