I currently have an old 18 inch Direct TV dish, that I installed years ago, I get 90's for signal strength. This weekend I went to replace this dish with a Direct TV Five LNB KA/Ku Slim line dish. I thought all I need to do was take off the old and put on the new dish and I would get the 101 signal. I get nothing. I do have a clear view. Does anyone have any ideas. Wouldn't the elevation be the same. Any help would be great !!!!!!!!!!!!!!!!!!!