How high is high enough? Does it have to be electric? Can't they just fly over an electric fence?
Home Depot has 72" high galvanized poultry fencing. Also found it on sale at true value and it was pretty cheap.
Thanks so much for your help.
You would do that for an acre? A square acre is over 800 linear feet. An electric fence of the type shown above would cost less and be many times easier to construct than an acre of physical fence.
As Zoomie suggests, electric fences are NOT a physical barrier of the type we normally think of. But once the birds get zapped a few times, they recognize it as a boundary they do not want to cross, so they go up to it, but won't cross it. If somehow they do find themselves on the outside, a fence of that type allows them to get back in. In a panic, they can punch through or easily lift up and fly over it. They will risk that to get back in. They do not seem to risk that to get out, even though the out option is the same.