What is the quality of the materials of the Greyline DX antennas?

We didn't cut any corners! Only premium materials are used throughout the system. The AI tubing is Made in the USA, double-dipped, double-walled, high-grade 6000 series aircraft-grade aluminum we are very proud of, 2-inch OD or 2.25-inch OD top to bottom, industrial-strength fiberglass insulators at the feed and base, stainless steel hardware throughout, and a 3kW custom made RF Choke to help complete your "floating" antenna system! This isn't your typical Amateur claim where "Rated 80MPH" means it folds at 50MPH. A Structural Analysis was completed properly.