Don't know anything about the rumour but having recently given up a career in environmental consultancy (windfarm & terrain engineering) for ATPL study I can say radar issues are a big concern as part of the planning process. Protection zones up to 50km exist around facilities and consultation with the MOD/CAA is required if there is any doubt - the consultants/planners will be onto this from an early stage if there are development plans afoot. The multiple returns from the blade tips give a twinkling effect. Though local residents being concerned about a/c safety sounds a bit NIMBYish compared to the noise, visual intrusion, chopping up birds, traffic issues and ecological damage. You'll probably find an initial 125 will be brought well down over a lengthy public appeal process. Beautiful and amazing bits of technology though!