Issues with viewing channels

I have my tuner set up with the most recent build of tvheadend. I'm scanned all the predefined muxes and came up with like 400+ channels. However, only 6 of them work. A few of them show as unencrypted but don't work and then the great majority of them are shown as encrypted. However, with my tv tuner, I get about 125 channels. I get them with the coaxial cable directly into the back of my tv (without a cable box). Anyways, I know there are a number of encrypted channels I'm not subscribed to, however i should be able to get all those unencrypted channels. Any suggestions? I have suddenlink cable if that matters.