I have D* svc., with a 5LNB, H20, and older RCA SD rcvr., and Sharp Aquos 32" LCD. Several times a night, while viewing SD the color loses green and blue briefly, then comes back. Repeats a couple times then stops. From the HR20, I get "blocking" of the image, and then it restores. Climbing on my roof, it appears my neighbor's cedar tree tops, swaying from the wind, could possibly be occasionally blocking reception. Before I call for D* service, I'd like to be on the right course to the solution to make sure they head in the same direction. Your comments are appreciated.