In the days of analog you could connect a walmart cable to the box outside, and your TV would receive cable. The cable box probably had an empty connection on the splitter outside to plug the cable into, and opening the box isn't hard so this entire process was well in the ability of anyone who could change their oil. There were plenty of bootleg instructions on how to bypass the scrambling system to get any channel, though the basic cable channels were not scrambled in the first place.