The 'Orgone Experiment' was led by Andrew Collins, on a hill in Wiltshire.

Group meditation was undertaken several times a day.

Photographic and other equipment monitored the events.

How can a horn sound appear in front of you, out of thin air - in broad daylight on open grassland?

This is indeed what happened in 1994 in Southern England!:

"Unexpectedly, we each then heard a distinct sound identified as a long horn blast - one single note lasting for approximately two and a half seconds.

It happened again inside a minute ........ as the cacophony of voices grew steadily louder, leading us to jokingly suggest that the commotion heralded the approach of the Wild Hunt"