They had some channels in the clear, but more and more went to encryption, which required a decryption board. This was black market stuff, usually your installer could get you a board and get you updates if needed.
They had actuators so they could receive from multiple satellites in an arc, and the channel lineups shifted around as well as the operators re-jigged the satellite feeds.
Once the services like Dish, etc came along, these really went down in popularity. The new services were more legal, used smaller dishes with a single satellite - no actuator needed.