Thanks for the comment. I doubt this would work in 70 mph wind. So far, so good with the mild weather here. I was worried about humidity so I sealed the mic element (in a short tube), into a 4-mil latex "finger cot" with a packet of silica gel. Then the mic assembly was built into a semicircular corner section made of thin wood sheet, covered with a piece of nylon stocking which is trapping about 2" of dead air space in front of the mic, all this mounted in a corner under the eaves of the house. Close up it's hideously ugly, but after painting some cardboard crudely mounted up flush to the mic edge, it may be mistaken for part of the house structure. From a distance, it's hard to see.
When the community service officer came to collect this recording, they wanted to see the mic, but had no further comment after seeing it, I don't know what they were thinking!
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EDIT: today there is a slight wind going to 15 mph, and the background noise goes way up. Not because of direct wind on the mic, but from rustling leaves on several trees nearby. The original recording was in pretty much still conditions.