I've been hired to shoot aerials for a corn maze and wanted to know what type of "On Notice" sign is needed at the entrance of the event. It's taking place on a private family farm that is open to the public and admission is being charged. I will be there for just a couple of hours and will be taking aerials of the maze, food truck area and pumpkin patch. I will not be flying directly over people but may be transiting over some people as I cross over the 1300ft x 200ft maze area. If it matters, I'll be in the 150ft -400ft AGL range so no faces will be able to be made out. In the video production world, we use On Notice signs all of the time when shooting in public locations but I don't know how to word one for this purpose. And yes, I do have $1,000,000 liability coverage with Air Modo. Thanks in advance.