I used the Premier 1 x 42" fencing for a few years, and still have it, but a change in my predator load rendered it useless. Huge increase in hawk predation, and the birds decided they wanted to fly over it anyways, so it wouldn't even keep them in. I put up a 6' high run. Chose 6', in spite of the $$ b/c it was a bit more of a deterrent to keep the heavier birds in the run. It also makes moving around in the run much less bothersome for me. Still, at 6' some will fly over the top. I keep bird netting over it in the no-snow months, and have put 2 x 4 galv. welded wire over one bay of it so they have a smaller but semi secure winter run. Hawk predation here even in snow months. If you put hot wire around your fencing, I would go with a minimum of 3 strands at the bottom starting at 4 - 6" above ground level, with the first 2 strands 6 - 8" apart, and the next strand 12" above the middle one. Depending on the size of your run, you could put bird netting over it. It comes in some pretty large sizes. Or you could simply run a webbing of fish line over it, and dangle some used CD's from the fish line. Those make an impressive flash as they move with the slightest breeze and catch the sunlight.