The ‘sky growl’, ‘angel’s call’ and ‘air drone’ last heard in Hookland in 1972 was put down to radio atmospheric signals by scientists.
The 'sky growl', 'angel's call' and 'air drone' last heard in Hookland in 1972 was put down to radio atmospheric signals by scientists.
— Hookland (@HooklandGuide) June 2, 2015