Directv is coming back to install a 5 LNB dish - I currently have a 3 LNB and just had a HR10-250 w/ HI-DEF programming installed last Friday. When i talked to Directv today they wondered why the tech didn't install a 5 LNB dish and wanted to know if i noticed a difference with the HI-DEF channels ? My stupid question is : Are the 5LNB and AT9 the same dish ? Why do i need a 5LNB vs. a 3LNB ?