I have a problem with one OTA channel, CBS. Every so often I get the signal loss message. Sometimes I get green pixels at the bottom of the screen. These problems last only a second or two & occur maybe once or twice during a program. It does not happen with satellite CBS. The OTA signal strength reading on the 722K DVR is typically from 78% to 82%. Once I saw it dip to 74. At what point would a signal loss usually occur? A lot of my channels are 90% to 100% indicated signal strength. I thought about installing an amp, but am concerned about having too high of signal level on these channels & overdriving the DVR. I do have a couple 4 way splitters that I could change to 3 way ones. Then use the -3.5dB (instead of -7dB) outputs to feed the Dish DVR. This should increase my signal strength by 7dB. Is there any rule of thumb that correlates a change in dB to signal strength percentage?