https://apps.dtic.mil/sti/pdfs/ADA580765.pdf (Table 5)
These guys checked the length of the wind turbine blade, then calculated it's resonant frequency and multiples it may emit or reflect RF at. Might be revealing to use an RTL-SDR and SDR# free software on a laptop and point a portable yagi at these things. If you're an optimist, there may be frequencies in the spectrum halfway between multiples of the resonant frequency they don't emit or reflect RF at.
View attachment 57597
Might be relevant if the blades were conductive metal, but they are usually carbon fibre and any relationship to a 1/2 wavelength of RF is nonexistent.