This is the tomato cage created by a friend of my father-in-law. His name is Rick. He used Galvanized Steel Cattle Panels (sometimes called wire panels). Each panel is big enough to make 3 of these. You will also need wire cutters. Can you see how the wire is about 4 inches apart (height wise) and the top two are not as far apart. You will want to cut them this way because you will cut the bottom horizontal wire off and then stick them into the ground with what is left. These are 4 ft tall tomato cages which are much taller than what you can buy and these certainly are very sturdy.
You can see here how he wrapped the wire around. In the fall you un-do one side and they fold flat.
See, the bottom wire is gone, leaving these nice ends to stick in the ground.