my tv still works with cable wire plugged directly into the back. so why do I need a HD cable box?
In addition to what Ms Raye posted, you are likely not able to receive every cahnnel you are paying for if you are only using your TV's internal tuner.
It's also possible that you are receiving ananlog versions of channels you are not authroized to receive, too.
Here in Ohio, they're a year behind with the cutover thanks to the sale to Spectrum and lack of money to replace several hundred thousand boxes and now DTA's...