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@ RF addick
That came out nice. What did you use for the collar holding the pvc pipe? I've not seen those before.
I'm guessing your gain is around 10-12dbi, based on an aperture of 8.5". FYI the larger outside metal ring isn't part of the parabolic curve's surface and neither are the spokes at the center. Only the surface area represented by the spiral wound wire should be used for depth and diameter measurements. I think if you factor those differences in you'll see the gap between the empirical and theoretical focal points converge.
You might also want to rig a means to adjust the focal point to find the best setting.
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