I made it just as long as I could given the trees I had, but I think I might add some kind of push up pole or something at one corner of the house and see if I can get a little more area inside the loop and therefore more wire. It's more like a big horizontal triangle now instead of a square. If I get it closer to a square I should get over the ~250' I have now.
I'm going to have to change the wire anyway, it's THHN wire and it will probably look like hell after a while when the insulation starts coming off. I just had a roll handy and I was bored so I went out and did it. I'm going to replace it with that stranded copper clad steel wire from The Wireman. I don't have any insulators on it now either since I'm not transmitting yet. The feed point is a mess of solder connections and wire ties and I'll replace it too with stranded window line and one of those ladder lock center insulators. Still it's doing great for a little over an hour of time putting it up and using wire I had on hand.
Shooting string in the trees with a slingshot was easier than I thought it would be. I did lose a little bit of string when I hung the weight in a branch and couldn't get it back down. So now one of my trees has a few feet of string and an old A2 flash hider hanging out of it. I like the look, but I'm not right in the head.
edit - wire ties, not wire tires.