The posted image comes from the FCC documentation, but in an unnoticeable corner of the wAP Ax brochure:
it is mentioned that Antenna Beam Width is 180°.
The way everyone measures this width in degrees may vary, of course, but calling the actual shape as 180° is a bit optimistic IMHO.
I stand by my "ball with flat bottom" definition:
this latter link includes a link to the FCC documentation containing the posted image.