I assume you have a 2 dish solution. Dish is trying to get away from that and get everyone on one arc, either western or eastern arc. I myself curretly have a 1000.2 w/ a 61.5 wing dish and wouldn't change to an eastern arc only dish due to the low readings in my area. I install these things and really don't want to lose 25% of my signal to that crappy 1000.4. I enjoy my 80% signal compared to 50% on the 1000.4!