One problem I noticed when
using 14 gauge electric
fence wire as a diagonal support is the difficulty in backing off
the tension if you tightened it too much.
The first alternative I
thought about was nylon rope, but I'm guessing the galvanized wire
would win that longevity race.
Maybe I'll use nylon rope on
the next gate so we can get a side by side comparison.
Nylon rope (like all thermoplastics) will creep under tension.