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Re: ariel fitting
The more gain an aerial has (the more elements), the more critical the aiming due to the lower beamwidth.
Unless it is a seriously strong signal area, I'd be surprised if overloading was an issue. That would be easier to see on analog TV, as the difference between weak signal "snow", reflections "ghosting" and possible overload - distortions, double images, grit rather than snow is visble.
On digital, any signal defect will cause loss of the weaker channels, dropouts, freezing, squeaks in the sound. Digital receivers may give a level & quality indication, but the calibration can be pretty rudimentary - and no help at all until the signal is giving something.
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