The noise can travel over 3/4 of a mile depending on cloud cover, wind, elevation and what sort of barriers are between the point that you are measuring the noise and the TP.
Golf courses and water have a huge impact on the noise.
Also, it depends how you define noise, is this a constant or intermittent? At 3/4 of a mile with a large open space for a barrier I perceive noise less than five percent of the time. Five percent being if the conditions are wrong I will hear the noise, not that I hear five percent of the noise.
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