Secret Of The Airlift (First Of Seven) -- A "Vittles" Plane on its return flight to Frankfurt sweeps close by the "Windmill" antenna of the CPS-5. Looking like a against wire marketing basket turned on its side, the antenna whirls round and round. The curved arm (at right) shoots an electronic beam out into space and picks up reflections of that beam as it bounces back from any objects it strikes, in this case, the planes of the airlift. May 06, 1949. (Photo by ACME Newspictures).