Street pole banner brackets from Windpro. Hurricane and Storm brackets are tested to withstand winds up to 70 mph—with Hurricane brackets holding up to a 20 square foot banner, and Storm brackets holding up to a 10 square foot banner. Hurricane and Storm pole banner hardware is all made with a rust-free, cast aluminum base that will fit square, round, or multi-sided street poles. The state-of-the-art, fiberglass arms are designed to flex in strong winds transferring the wind load off of the banner.