You probably have a D500 with Twin LNB pointed at 110/119 and another D500 pointed at 61.5. The installer might have been talking about adding another D500 for 129 or 72.7. Either would fix you up.
Im confused.. the current installed said He would be replacing my 2 current dishes with one eastern ARC dish that gets all 3 satellites BUT a tree was in the way for the 72 satellite..the 1st guy that came out said THe tree might be in the way but installing a 3rd dish should solve the issue. HOW is that possible? I asked the installer who just left and he said he never heard of 3 dishes for this type of install but I see others on here who said they now have 3 dishes????