I don't have one... I just noticed when I was setting up my TiVo that there were diff instructions and cables depending on whether or not I did have one.

*rereads what she wrote* Okay yeah, that was kinda confusing... I meant your plan isn't much more than mine, prob (though mine's combined with Internet, so hard to know - I think it works out to about $10 more from what I recall reading on Shaw's website), then there's just the cost of the box.