I needed a brass catcher

Happily, that's pretty straightforward:
Take some 1/4" diameter bar I had, a piece about six feet long.  Bend into a circle

This stuff isn't hard to bend, even cold.  I did this around a 14" wheel.

Get the shape neatened-up a bit, then bend so you've got two legs

Figure how high you want it to stand, bend the legs back at the appropriate point

Bend the backs of the legs so they overlap

You can leave them loose, but I'd suggest either taping, wiring or welding them together.  Do any necessary bending to make it sit flat, then lace on some netting or something, and you have this

Tried it out a few days ago, and it worked nicely for things that eject to the right and a little forward or back, just move to properly intercept.  If it's windy you can set something heavy on the legs, another reason to have them overlap at the back.  Or if you don't mind the weight when moving it you could weld or otherwise attach a piece of bar or something heavy enough to stabilize it.