.Go to any hardware store and get those 12 " long nails, I like the galvanized. They work in all conditions and pretty cheap. I have a friend that get 3/16 rebar and heat and bends them 90*. He goes with 12" and 18" long.
Yeah, I've used both from others...not a fan of the nails, though I appreciate the suggestion, as having no hook in some applications let's your guy line come off if a downwind gives it some slack, no matter how steep an angle.
I liked the rebar, but for it's roughness on line, and may get some 3/8 to heat and bend for extreme weather, though I doubt my propane torch is hot enough. I've got it in my head I want more like the thick Oztent stakes that have worked so well for me. I know they're available somewhere.