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Most advice I've seen for VG placement on a passenger car is for them to be about 100 mm in front of the start of the major rear angle. So on a Jetta, I was thinking right in front of the antenna. This is quite a bit further forward than at the glass line (or on the glass for that matter). I think the VG effect takes a bit of distance to occur, perhaps depending on vehicle speed....?
The deck lid extension results thus far don't look great. But I'll stay optimistic for now.
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