Whose ARF or kit is that? Nice looking plane, modified WACO UPF-7, I believe, but the bottm wing dihedral is gone and it has a bubble canopy. The WACO's used wires instead of a stiff brace, and you'd need them above and below the H stab. As far as that goes, even the stiff braces (such as piano wire) should go above and below, as the brace works better in tension than in compression. Here's a pic of my L-4 braces. This is the clevis method mentioned above. I soldered one clevis, and threaded the other one with a locknut; allows adjustment because it's difficult to get them exact, and the Cub used the adjuster, so it's a scale detail, too.