Both antenna are fed by a stacked beam composed of six feed horns.
These types are often used as feed horns for wide search radar antennas.
They are used in applications requiring high performance, such as feed horns for communication satellite antennas and radio telescopes.
Used as feed horns in radio telescopes and other high-resolution antennas.
The feed horn consisted of a cross dipole antenna design for both A and B channels.
As the feed horn is fixed in nutated feeds, no polarization changes occur.
In Satellite antennas, scalar rings are used to push the spread signal into the feed horn.
Therefore the feed horn must be longer for a given wavelength.
The flyaway kit doesn't look terribly sturdy, and I'm curious that there's no feed horn.
I'm guessing the feed horn wasn't affixed on the unit they had out.