Wis. Stat. § 703.105: Display of the United States flag and political signs.

(1) No bylaw or rule may be adopted or provision included in a declaration or deed that prohibits a unit owner from respectfully displaying the United States flag.

(1m) No bylaw or rule may be adopted or provision included in a declaration or deed that prohibits a unit owner from displaying in his or her condominium a sign that supports or opposes a candidate for public office or a referendum question.

(2) Notwithstanding subs. (1) and (1m), bylaws or rules may be adopted that regulate the size and location of signs, flags and flagpoles.