I use a 3ft wide sheet of roofing tin,
cattle panel and tposts. Put 4 tposts in the ground and wire your panel to them. Put the tin on the north side and take 4 more tposts and put those on the outside of the tin so it is sandwiched between. You don't need to drive the second set of posts into the ground. Wire the posts in pairs with tie wire under the tin and over it. You are wiring the sets of posts together, no need to drill or fasten anything into the tin.