Wind turbine

[NorthernRaider]

HL I have seen very similar if not identical units mounted on the end of a row of timber stables and you hardly noticed it, certainly not even enough to startle the horses, about the only way that thing could develop noise that would attract your attention is if you had the wind direction changing instantly and frequently IE the nacelle spining in its vertical axis in gusty wind. If you have a paddock of uncut meadow grass or grain growing near by the noise from the grass rustling in the breeze will be much louder.

Your local council environmental protection officer will have a sound measuring device that you can use in your garden to measure the ambient background noise and compare it with the turbines.