Hi, I currently have sattelite reception to the box using my 18" round dish. Using RG6 cable that is already wired and working . Switching over to oval 3LNB for HD service. . No signal at receiver. House is wired with RG6 cable. Checked meter reading at garage (thats about half way to receiver) and meter readings are diminshed.Checked readings at receiver an nothing. Dish and transponder are brand new. How can it be that 18" sattelite works but new dish does not through same cable line? Please help!!!