Thanks to Google, this question would be too easy with multiple choice answers, so it's a fill-in this time. I'll give you a hint though : it's a direction-finding antenna, and it is known by several names, one of which begins with w......Good luck!

What is a name for this antenna?

A few answers: Wullenweber, CDDA (Circularly Disposed Dipole Array), CDAA (Circular Dipole Antenna Array), AN/FLR-9

A very cool antenna, wish I had one...........