TexasCHLforum.com

(19) (A) Any place at the discretion of the person or entity exercising control over the physical location of the place by placing at each entrance to the place a written notice clearly readable at a distance of not less than ten feet (10 ft) that “carrying a handgun is prohibited”.

This part is also noteworthy. I talked with a Arkansas State Trooper in the past, and she confirmed that a gunbuster sign is not binding in Arkansas. The sign must have text in order to be enforceable. However, the contents of the text are not specified by law (like they are in Texas), so just about any sign that says "no guns" in writing is valid.