The Hopper is connected to WiFi and Internet. I could connect the Joeys to the same home network if that's neccesary.
I already have a modulator to distribute the Hopper to plain-old-TV's and could use that for the NetFlix box, but we no longer have Coax where the Joeys are located because I gave that Coax to DishTV to run the Joeys.
----------An Update after getting helpful responses from the many posts below -------------
From the posts below I found there is no reasonable way to play NetFlix or Amazon-Prime through the Hopper or Joeys, so a second source for these programs needs to be routed to the TV's independently of the DishTV system. In our installation we take advantage of the Radio-Frequency feature of the DishTV 40.0 remotes by positioning the Joeys centrally in the house so they are within range of 2 or 3 DishTV remote controls in different rooms. (we modulate the Joey outputs for the secondary rooms)
So for our needs the RoKu 3 provides the best second source for NetFlix and other on-line content because it also has an RF remote allowing the Roku module to be installed out-of-site and in our case closer to the WiFi router. Unfortuantely RoKu 3 only has HDMI output so it can't be modulated. Earlier Roku models can be modulated but they don't have RF remotes. We tried to get by with a Sony BlueRay player for access to internet content but it way under-performs the RoKu3 in every way.
Now that there are 2 HDMI sources to the TV, by default the DishTV remote cannot control TV sources. But if you go to Remote Manager, you will find an option to turn off "Limited Mode" allowing the DishTV remote to control TV sources.
Edited by swbca, 11 April 2013 - 10:09 AM.
Updated with an answer to the Question