I currently have two non hdtv recivers for my direct tv. I went an bought a triple lnb oval dish. In an effort to slowly purchase the required equiptment for hdtv. However when I hooked up my two recievers to the triple lnb dish. I can only get a sat signal on one of my recivers even though I am getting a good signal on the 101 sat and the other two also. Is there something I am doing wrong please help me.