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Mmmmm I think the trick is to be in laminar airflow. This is the reason why Hargraves works, also the ridge at Mt Banks, where you're on a ridge with a long valley floor stretching upwind; at night the wind is usually a southwesterly.
Even in the UK you could get the same effect if the wind is from the right direction blowing onto say Mam Tor, Stanage Edge in the Peak District, or the Lothians south of Edinburgh. But the scope needs to be right on the high point of the ridge, no more than 30 metres from the edge if there's a cliff.
Last edited by Wavytone; 20-01-2014 at 11:36 PM.
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