I have installed two Hopper3s with a total of 10 Joeys (5 on each hopper). I utilized a hybrid LNB and Western Arc with hybrid solo hub and 4 port splitters. At first I thought I could utilize the Dish Hybrid Duo Hub 203961 and one DISH. It kept telling me that the 2nd Hopper3 was connected to the wrong port. I had to install a second Dish and utilize two Hybrid Solo Hub 203952, one for each hopper(dish) and two 4 port splitters to get the joeys to work. This worked fine...I'm actually wondering what the DISH Hybrid Duo Hub is for? Could I've utilized a single Hybrid duo hub in place of using two hybrid solo hubs?