Called DTV to discuss replacing PLUS DVr"s (2) with HD DVR's. We also have 3 other SD units with our 3LNB dish with 4by8 splitter. They indicated I needed to upgrade to HD Dish, tried to ascertain if it would effect line of sight. Currently, have perfect line of sight for SD dish which required significant tree work at installation in 2006. Asked if they could certify there would be no line of sight problems before going forward, never answered but wouldn't send Tech to verify installation 1st, even if i agreed to pay for service call. Order equipment they'll schedule no equipment no tech visit. We didn't want to upgrade TV's unless HD dish would work. Anyone know how to locate a qualified DTV tech to do site evaluation before moving forward, we are located on Hilton Head Island in SC. DTV answer was search their website for DTV/retailers. Only one close by and dingy little shop that also specializes in Western Union, household help etc. didn't give us a warm comfortable feeling about expertise. Last installation took 3 different installers before finding a qualified person who knew what they were doing. If it weren't for the NFL package we'd go back to cable. Any suggestions would be greatly appreciated or if qualified installer sees this question, please respond. Thanks!