I've got spikes up to 5' long that I made from 1 1/2" schedule 40 PVC. They're nothing fancy, just a length of pipe with a very long and narrow point that I cut with my table saw. I've glued a sanitary tee to the top of some of my spikes to hang my propane lantern. It works great, puts the light where I want it and keeps the bugs away from where I'm sitting.
Catman.
Catman.