As far as “what’s it for?”: All antennas are designed to receive and/or transmit on some range of frequencies. In this case, the antenna is designed to operate on the frequencies the FCC has assigned to the amateur radio service.
This thing is a monument to an impressive level of dedication to the craft of blabbery (and in the case of a disaster, a live-saving communication network of course…)
Don’t be fooled. It’s obviously a shield to protect us from the Jewish Space Lasers that Margorie Taylor Greene (aka Marge Three Toes) warned us about. She also warned us about Pelozi having a “Gazpacho Police” and, of course, about Bill Gates wanting us to eat fake meat “grown in a peach tree dish.”