Just in Holland and Germany alone there are over 1000 separate citizen groups trying to get compensation for those suffering from the noise. You could start to suspect that the problems seem to be more serious than just something inside the shadow distance.

Just out of curiosity here's the noise profile (spectrogram) of a turbine at 1,37 km (0.85 miles), measured inside a home, where we can see the base frequency and several harmonic multiples:

http://i.imgur.com/m31hhR5.png

Here's the same turbine at 5km (3.1 miles), again inside a house, where the turbine is shut off at 11 a.m.:

http://i.imgur.com/pRJeunj.png

As we can see this low frequency noise can travel very long distances, and when you have wind farms with multiple turbines they can even create interference patterns, that could amplify the problems further.