Is it possible that a tree is blocking only part of a satellite signal. I have "missing" channels on 61.5 or some that you have to scroll up to get versus punch in or get from guide. Examples 110, 108, 395, 396. Signal strength on 61.5 is about 46-47 and on 72.7 and 77 runs about 50-52..think those satellites are coming in well (1000.4 EA LNBF).