I have two Series2 with Lifetime and think it's time that I take the plunge to HD. I have some questions. Will the addition of a Cable Card allow me to not use a Set-Top Box? Do I need a Cable Card for OTA? The root of my question is, I'd like to set up my S3 or HD TIVO (yet to be purchased) to use my OTA and Comcast Cable Card (No Set-top box). -Status p.s. Yes, I do have a HD TV to go with the mix.