I'm surprised that the broadcast industry is just discoving this topic. My library of decades-old antenna handbooks covers this quite well:
https://www.radioworld.com/show-news/nab-show/why-well-dressed-towers-may-wear-flared-skirts?utm_source=SmartBrief&utm_medium=email&utm_campaign=33CCA446-266B-43B6-8A18-118AF7B202FA&utm_content=E5518F4E-90C4-40BF-B705-81A7DB3E8C14&utm_term=5e35c2b9-3044-4235-9961-04d879406e09 73, Jeff KH6O _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
