I made a lot of different ones and for me the best ones are field fence 4' tall and about 2 1/2' or so across. You can tie more fence on top of the cage too, if you want, so you can get more height. I hold the cages up with one or two fence posts. the other one I've done is a hog or cattle panel...
I plant them with my Tomatoes and peppers too. They're really quite easy to grow. I have some that comes up in the fence now :/ I think the birds planted them for me :lol: