Advertisements I have one channel: 24-1, RF 33, 587mhz which gets a weird line of shifted blocking several times per hour. Not enough to be a problem, just enough to be annoying. The signal is solid at 72% / 29DB with 0 RS Uncorrected and 0 RS Corrected. I will admit the antenna is completely oversized for the application - Tower is 19.7 miles away and using a HD8200U. Anyone have any suggestions as to what I should investigate? Is the source of the problem at the tower and I'm wasting my time investigating my end?