It's not just radio towers. I've seen aircraft warning lights on tall buildings, particularly those near airports. see https://www.ecfr.gov/current/title-14/c

It's not just radio towers. I've seen aircraft warning lights on tall buildings, particularly those near airports. see https://www.ecfr.gov/current/title-14/chapter-I/subchapter-E/part-77/subpart-C/section-77.17 https://www.ecfr.gov/current/title-14/chapter-I/subchapter-E...