So...you're driving aimlessly around the countryside near Bondville, Illinois and you stumble upon these land-scars. They are the remnants of the original Wullenweber array built (or, more precisely, "reassembled" from a dismantled German antenna) by the University of Illinois for HF direction finding research after WWII. The term "Wullenweber" reportedly derives from the German code name for their Circular Disposed Antenna Array (CDAA) research during the war. Not sure what the square area was, but it has signs of having hosted antenna research of some kind. [40 02 59N, 88 22 51W]
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