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Fixed antenna? A rotor may be needed then.
I know from personal experience in more than one location that a rotor is often times needed even if all the signals are coming from the same compass reading or close to it. In my current location just south of Cincinnati, I have 3 UHF signals from Dayton that come in. But if I move the antenna either a few inches upward, sideways or downward, it impacts these signals. Depending upon the way I move the antenna, a couple of signals get stronger while others get weaker.
BTW. Are you using a good quality RG6 cable or RG59? A good quality cable will take longer to deteriorate than a poor quality cable.
Years ago when 300 ohm flat cable was common, I can recall seeing signal loss develop after a few years of use. Cable had to be replaced about every five to seven years simply because it deteriorates in the sun, cold and severe weather conditions.
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