@ sdubb
My experience with the HDHR has been that any signal strength or quality below 50% is an indication of imminent errors which will be visible as pixelation or signal loss.
Signal strength is an issue for you in the case of both channels. An amplifier might help... if the signal at the input of the amplifier is not already 'buried' in noise, distorted by multipath or other impairments which amplifiers are incapable of fixing. In other words, the antenna must be receiving a usable signal with enough quality to tolerate the damage that the amplifier will cause.
http://forum.tvfool.com/showthread.php?t=1514