Flying Binghi
blaming towers 9 kilometres away is a bit of a stretch.
Maximum leeward windbreak effect is usually calculated at 30 times the height of the highest tree (and that is for conifers with around 40-60% density - much denser than 3 rotating blades)
The Gunning towers are 80 metres + 1/2 the rotor (49.5) metres gives effect distance of approximately 3 or so kilometres - well short of the 9 kilometres claimed.
regards
layman