As far as I know the angle should be 45 degree or more, any thing less is relatively inefficient. Now that we've established a min range i'd be interested to know what is the max range.I would imagine it's largely dictated by the shape of the gate, and how many ledges you have. I would guess around 45 degrees to be optimum, but I'm sure a grown-up will be along soon with a proper answer.
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