Orbit is supposed to work only with their supplied decoder and subscription (I'm not saying there are not any "hacks" out there!), and I think Showtime and other similar satellites are the same.
Plenty of "free" stuff available, but largely "Italian pseudo-porn phone-me" channels, others good if you speak Lithuanian or Polish. Couple of "Church Channels", and a few rock music channels.
Unless you're into"hacks" and can find the one for the sat you want, and it doesn't stop decoding after a couple of months, then you've probably got to fork out for the "proprietary" decoder and the annual (or monthly) fee.