Okla. Stat. tit. 60, § 858

An owners association, condominium association, cooperative association or residential real estate management association shall not adopt or enforce any policy or enter into any agreement that would restrict or prevent a member of the association from displaying the flag of the United States at a reasonable height, not to exceed twenty (20) feet, on residential property within the association with respect to which such member has a separate ownership interest or a right to exclusive possession or use.