I used to net my blueberries with a temporary, walk-in cage whose uprights were 8' long metal electrical conduit pipes pounded into the ground. I connected the tops with pvc plumbing pipe, putting T's at appropriate places to sit on the metal pipes. I then draped netting over the whole cage and held down the edges with metal stapes and pieces of pipe.
I recently upgraded to permanent side netting held up by locust posts whose tops were joined by rebar. When fruit is ripening, I drape light netting over the area and further support the middles with metal conduit pipe capped by an overturned jar.
Attached is a lo-resolution image of the uncovered cage.
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