Hi folks, First time poster, long time lurker here. I stepped up and had an HR20 and R-15 installed this past Saturday. A directv vendor out of the Buffalo area did the install. The installer was very knowledgeable and clearly experienced. After he departed, I discovered that I can't recieve channels 72, 76, and 79.. Tuning to those channels results in "Searching for Satellite" messages.. He had to navigate around some decent size trees and everything else seems to be coming in ok. I have a service call placed and someone should be out here tommorrow AM. Any idea if those 3 channels are on the same bird? Thanks for your time.