Short version: I want a comercial hammock stand that will work with a gathered end hammock. What do I need to look for?

Hi, I've been lurking for a little while, and today I've got a paycheck burning a hole in my pocket. My hammocks don't usually get a lot of use. If I'm going out with my BF we just take a two person tent. I'd like to set up a hammock in the yard, but we don't have the trees. I don't want to build something myself. I'm thinking of making a tablecloth hammock for the near future, and have the long tearm goal of weaving something pretty. Anyway, what do I need to look for to make sure the hammock won't sag and hit the bottom supports?