Some points from the news article. Communications towers have the option is the key for you WISP friends.
New FAA regulations require landowners to mark any towers between 50′ and 200′ on their property, as well as include the towers in a new database the FAA is developing.
The new requirements are due to provisions in the FAA Extension, Safety and Security Act of 2016 and the FAA Reauthorization Act of 2018.
Under the provisions in these laws, meteorological evaluation towers (METs) meeting the requirements stipulated in the bills must be both marked and logged in to the FAA database. Communication towers of the same size have the option to be either be marked or logged in the FAA database.
https://generalaviationnews.com/2019/07/08/new-faa-regulations-require-towers-under-200-to-be-marked/ j2networks family of sites https://j2sw.com https://startawisp.info https://indycolo.net