Yes, we had to buy some of those too to help with the grounding out, but I would say it only helped minimally. But to be fair, we are pretty hilly here.I admit that I've bought a bunch of cheap step-in posts from the farm supply store to help contour the fence over the lumps and bumps -- the white posts in the background of these photos. (The short green posts are holding the chick-tight inner curtain fence (plastic hardware cloth)).
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They're not as tall as the good extra posts from Premier 1, but they do the job.