In my system is three RF modulators from three HWSs, combined by coax into a three way splitter. Combined signal then goes thru an amplifier into a 12 port home distribution splitter to all my home TVs including the three HWSs’ TVs with the exception of my kid’s TV. TVs have a choice of which Hopper to view by changing channels to the Hopper you want to watch. Presently the three Hoppers with modulators use channel 20, 25, and 30. This setup accomplishes two things for all my TVs with the exception of my kid's room TV. First, since the Hoppers do not have sync capabilities for recorded programs, any TV can sync with a Hopper to view a recorded program at the same time with Hopper of choice. Second, all TVs are not stuck with having to view only one Hopper. All the TVs that that are viewing the modulated signal the picture quality is pretty good SD quality.