This is my first time on this forum but it sure looks like there are alot of knowledgable people here. I presently have a std dish setup feeding 2 only 4100 receivers. I just purchased an HDTV and hooked it up to a new 6131 HD receiver that replaces one of the 4100's. Of course I dont have the hd channels yet. I purchased a Dish 500 legacy twin dual output lnb with built in switch SW21 from ebay and want to change the dish so I can receive the hd channels on the HDtv and still feed the 4100 std digital receiver. Having looked at this forum I am quite confused. Would anyone know what is involved in replacing the std def dish with the 500 dish. Thanks in advance.