Prototype Antenna Element | University of Illinois Archives
From the back of the photo:
"Prototype antenna element for Unversity of Illinois 400-foot radio telescope, 1958.
This is the J.D. Dyson Log-spiral design."
Original print located in RS 11/6/21, Box 1, Folder "Radio telescope, Vermilion River Observatory, Danville, 1958-1962".
original photo size 20.5 x 25.5 cm
Electrical Engineering Department
Vermilion River Observatory