In an attempt to replicate the nice torus shape, I recycled Fat Bird and built a real Slim Jim. Nothing I would consider experimental as it seems well documented. To keep the size down, I target the 900MHz IMS band. Using calipers and carefully measuring the lengths, when it was all done I had constructed a pile of crap. Note my patent pending slide turning stubs used to overcome the problems. The SWR is decent enough.
I started out running a 4 X 4 sweep (4 azimuth 4 elevations). Antenna was mounted vertical and view is looking down towards the top of the antenna. So we end up with a box with the lid sunk in. Seems like a sort of doughnut.
Next, crank up the resolution....