</font><font color="blue" class="small">( I think you'll find it much cheaper to change from 30' to 10' spacing between support post. Making that change will allow you to use much cheaper supports, even if you need 3 times as many they will be one tenth the unit cost. Another problem would be tensioning 30' of cable to remove the sag isn't going to be an easy thing to do. I think the least expensive long term method would be to build it like a chain link fence. If you can't find a cheap source of pipe long enough for the 12' height, you could weld sections of standard length together.
Something else to consider is that on the fields I've played only allow spectators on one or two sides of the speedball fields. Doing that could allow you to put up just a standard rail fence on the other sides to mark the field boundaries. Will this be the only field you putting in, or are there others in the planning?
)</font>
I'd like be able to split my field in half some how, but not have any big posts in the middle. I also may want to add another field, but it would be smaller.
I want to minimize the number of posts, especially if they aren't set up for 12 or 20 foot netting. Then again, it's all about the money for the most part, as there's going to be a lot of work either way.