Hi @g0nz0,
Welcome back to our Community Forums! Thank you for your post and I'm glad that you're now a part of our Community! We're here to help!
As @jb66 and @nodrogd advised, in order to have access to Multi Room, it does require you to have more coaxial cables in your home, as the TV boxes would not be able to receive the live broadcasting signal without them.
Is there anything else we can do to help you today? Let us know.
Thank you. 🙂