From the BBC:A wind turbine blade that absorbs radar signals has been demonstrated at a wind farm in eastern England.
Wind turbines confuse aviation radar signals, making aircraft in wind farms' vicinities difficult to track.
Defence firm Qinetiq and turbine manufacturing firm Vestas are developing "stealth turbines", with radar-absorbing materials and coatings.
The five-year effort may help many wind farm projects that are on hold because of so-called "radar clutter" concerns.
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