I just made 12 of those pvc feeders there very simple to put together.
All of the supplies you need can be found in the plumbing section of the hardware store. You need one long piece of pvc pipe, 2 pvc caps to fit the end of the pipe, a 90 degree curved piece of pvc, and some cement glue. It takes about 15 minutes to stick every thing together, once you make it seems like you become your own assemble line and can make several more in no time. Each of my pvc feeders are 5 feet tall (you can make them any length) and I tie them to fence post and/or tree bases.