The Dish tech guy came out today and did his thing in about one hour. He used my old dish and replaced the LNBs with a dual system. He had too much difficulty going through trees. I was a little afraid of that as my dish was attached to the antenna tower. I told him to go ahead and attach the dish to the roof wherever he could find the best LOS. He told me that up until a year ago there was no choice but to install the stuff as it was done. It was only then that Tyler locals were available on Dish as HD. I now get my Tyler locals in HD so all is well. Thanks to everyone that helped me understand all this.