Mylinux wrote:
"Please."

The antenna pictured is a "grid dish" of the type practical below about
3 GHz. Its advantage is reduced wind loading.

Above about 3 GHz, the spacing between grid elements becomes so small
that advantage of the grid over a solid sheet of metal becomes
impractical.

Polarization of the reflector is in the direction of the length of its
elements. Polarization of the driven antenna element must agree with the
reflecting elements in the dish.

The ring-back construction is typical of a company, "Anixter Mark",
formerly "Mark Products".

Best regards, Richard Harrison, KB5WZI