thank you rglore.
Unfortunately, I have a few challenges that make splitting uneasy.
1) TV1 is in the living room where the 722 is, and where the hopper would go. TV4, is in an outdoor gazebo 55 feet away from TV1. THere is a 1/2 inch conduit available to me to run coax and cat6 from the house to that gazebo. I can use an HDMI splitter in that corner to feed both TV's, but I would need an HDMI-to-ethernet conversion to get HD at the gazebo; I don't think that HDMI will fit in a 1/2 inch tube, and I haven't seen HDMI cables that long.
2) TV2 is in the dining room and TV3 is located in the second story but not directly above the dining room. I would again have to use ethernet-to-hdmi converters to get up there. It is doable, but requires some work that I am willing to do. I have to decide if doing all this is worth saving the $14 a month fee for 2 Joeys; it sounds like it's not worth the hassle.
I just learned that each HDMI extender requires 2 ethernet cables, and that complicates things.