I just successfully self-installed a 5th Joey in my 2H system. The only issue I had was getting my hands on a dish-approved 3-way splitter (they are currently on back-order). It turns out that Ideal makes a series of 5Mhz-2.4GHz splitters that out-spec the Dish approved splitters. Used it for this install and still have full strength MOCA readings on all Joeys. These are available at Home Depot and Lowes.