There is no brand on it, I looked. It is very old and I got it at a thrift shop probably 20 years ago. All it is is two uprights with notches on the top. The inner hoop has a wing nut and a bolt that slips into the notch, that's how I tilt it to whatever angle and tighten the nuts.
The base is just two pieces of wood for the feet with a crossbar between them and more bolts and wing nuts to hold the uprights.
I bet any do-it-yourselfer or carpenter could make this stand for a purchased wooden hoop in any size. It could fit multiple sizes by using different sized crossbars.