Q: Does this system include everything that I would need to receive free satellite stations? Do this only operate one TV or do I need an additional receiver or something? Also, what happens when the channels get scrambled? 

A: From lyngsat.com  you can view sat and channels info,  any channel marked as in F means free channel.  when it becomes scrambled, then it is not available.

system is for one TV,  additional TV needs a extra receiver and extra line sat signal.