That's the only way, AFAIK, to eliminate the issue of the single Harmony (or both) triggering both Dish boxes in close proximity.
If you could describe your entire system in greater detail, perhaps there is another detail we could go on here. YMMV.
Hey guys, I'm using a series of Harmony 1100 remotes with RF extenders. All my components are in a media closet, and inside this closet there are 2 Dish Network Hoppers and 2 Joey's. When I send a command to one Dish box, it ends up sending to another one as well. This even happens when the RF extender is unplugged. Is there a way to combat this?
Thanks guys

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic