If you are using the old-type 5' concrete reinforcing wire that comes in a roll, you need a t-post every six feet.
If you are using the heavier gauge CWR that is sold as a flat panel - which is more common nowadays - you can probably space them at 8 -10 ft. I've never used the panel stuff, so that's just a guess. The gauge looks to be about half-way between regular CWR and a cattle panel. The roll wire is getting kinda hard to find. Many stores don't carry it anymore - the panels are a lot quicker and easier for contractors to handle, but harder for us because there's a lot of cutting involved.
Trellises should always run parallel to the prevailing wind. Here on the Gulf Coast it's south to north, but the swirling winds of a strong thunderstorm can do a lot of damage all right!
Jack
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