George P posted for all of us...
On Thu, 11 Oct 2018 16:17:54 -0400, Tekkie? wrote
I agree Tapcons. You might be able to get in aluminum or plastic to prevent
rust.
Tapcons?
How to Fasten a Sign to Concrete Using Tapcons
https://www.concretefasteners.com/di...e-with-tapcons
That seems simple enough!
I buy the Tapcon bolts at Home Depot & drill one into each sign corner.
No, the sign... Brain fart.
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Tekkie