Hops weave in and out of the wire. No problem with the wind blowing them down.
Just remember to plant them on the
out side of the pen, about 1.5-2' from the pen.
Do not let them attach till 3.5-4' high, to prevent them from eating to tops off.
Another option if you do not want them to attach to the wire, is to build a trellis far enough away from the pen so you can walk between the pen and trellis. Build it as high as you want. Hops will grow 15+ feet.
In tha fall, after they freeze and die, cut them down to the ground. They do not re-grow from the vines, just the root, each year.
If building a trellis away from the pen, I'd consider planting grapes. This will give treats for you and the birds. They grow back from the vine, so less work as well.
Maybe hops along one side and a trellis of grapes on another side......lots of options you can think up.
When ever I plant new stuff at my place, I try to choose bushes that will provide berries for me and the birds. They do not have to be planted inside pens.
Saskatoons, Honey Berry, Currants, Raspberry.......
I trans planted a couple Tamarack trees last year, for a wet area to the north of me. I got them from an area that was mossy, with some kind of low brushy stuff.
Checked on them later in the summer and it turns out the low brushy stuff is low bush Blueberries !
I'll be transplanting many next summer ! Nice easy digging in moss !
I'm sure you could find places like this down south:
http://saskatoonfarm.com/Here in AB they have a shelter belt nursery for trees. They are free. I ordered about 80 Spruce (they sent Pine and all but 3-4 died) but there may be a place like this in your State ?