If I remember right there was a study done comparing the kind of corner NR pictured and a conventional H brace. The former was considerably stronger.
The secret is that when pressure is put on the wires the brace pushes against the ground. H braces rely on the strength of the posts more.
The secret is that when pressure is put on the wires the brace pushes against the ground. H braces rely on the strength of the posts more.