Porch leaners are the best.
This one measures 48x9 with painted on letters and a 3D element of the two hinges attached for some dimension.
You can make this at a workshop, a DIY kit at home, have a kit shipped to you minus the wood (you'll have to get your own at your local lumber store, you'll need a 1x10 and 48") or have one pre-made for you.