I believe I used 3/4" threaded galvanized pipe from Home Depot as well. I bought two 4' lengths and used a coupler. I stuck those in an umbrella stand for the winter; I'll do something more permanent in the Spring.
I drilled pilot holes in the pipe for the screws. So far it seems to be working!
I drilled pilot holes in the pipe for the screws. So far it seems to be working!