In Arizona state law changed a several years ago and homeowners associations can no longer prohibit placement of for sale signs on property per ARS 33-1808 which I have copied the portion that refers to real estate signs and open house signs.
F. Notwithstanding any provision in the community documents, an association shall not prohibit the indoor or outdoor display of a for sale sign and a sign rider by an association member on that member's property, including a sign that indicates the member is offering the property for sale by owner. The size of a sign offering a property for sale shall be in conformance with the industry standard size sign, which shall not exceed eighteen by twenty-four inches, and the industry standard size sign rider, which shall not exceed six by twenty-four inches. With respect to real estate for sale or lease in the planned community, an association shall not prohibit or otherwise regulate any of the following:
1. Temporary open house signs or a unit owner's for sale sign. The association shall not require the use of particular signs indicating an open house or real property for sale and may not further regulate the use of temporary open house or for sale signs that are industry standard size and that are owned or used by the seller or the seller's agent.
I remember when this legislation was passed waiting until it became effective. I had numerous listings in a gated community in southern AZ and I was putting up for sale signs the day this law became effective.