How do you convert your cable company's digital signal to analog so you can watch it on your tv without paying for a second set top box?

It's not so much in the conversion of the signal to analog, but rather, the frequency ranges the cable company may use to send the signals down the cable. In other Words, will a standard digital converter box that's out on the market today, have the ability to cover the cable company's sent signal? You may get some of it converted, but I doubt you'd be able to cover all of the available frequencies.