I will be setting up a Dish Network
HD satellite receiver in my RV and I need to purchase an appropriate dish that will receive both standard and high def signals. The dish I saw has 3 LNBs. One of the dishes I saw advertised on the
Sadoun website has only two (#16, Dish Network Pro500 on sale for $89) but it says there that it can receive HDTV at 110 and 119 degrees. What will I, if anything, be missing if I buy this setup or do I need to go to one of the two more expensive (SuperDish 105 or 121) dishes? Specifically, what are the satellites at 105 and 121 degrees for?