My local HD channels have coming and going throughout the day. This is a recent problem within the past 6 weeks or so. I receive my SD locals without problem. The receiver is the directv HR20-700. I have the dual tuner turned on. I also have a Hughes DVR40 in the master bedroom. I have tried the standard reset the receiver. Sometimes it makes a difference, sometimes not. There is no line of sight problem with trees or weather. The problem will occur on a sunny day and there are no tall trees in my neighborhood. On SAT 101 I am receiving high 80's and 90's on all transponders except, 4, 12, and 20 for both tuners. On SAT 110 I am receiving 89 and 91 on both tuners. On SAT 119 I am receiving 90's except for transponder 23 and 31. ON SAT 99(b) Tuner 1is 0, while Tuner 2 is 37, 79, 27, 85, 28, 85 (Transponder strengths) On SAT 103(a) Tuner 1 us 0, while Tuner 2 is 91, 0, 91, 0, 91, 0, 0 (Transponder strengths) From reading the forums SAT 99 and 103 are the HD channels, correct? I have not been having the problem on the national HD channels (72-79), only my local channels. I did not have the b band converters on until last night. I installed them hoping to make a difference. I have a technician coming Tuesday afternoon (June 5, 2007), but I always like to point out possible causes and solutions. Any help is appreciated.