It's a biconical antenna with a reflector(?).
Bico antennas are very common in EMC testing because they have a very wide bandwidth although at low gain. They generally behave as a dipole would. The common bowtie element is a common 2D variation of the bico. I use a bico antenna in my lab for antenna measurements (
http://www.aaronia.com/products/antennas/BicoLOG-5070/)
Can't say I've ever seen one with a reflector before. The effectiveness of the reflector is going to be seen at some particular set of frequencies related to the spacing of the reflector from the driven element.
