This film, which is also being shown on June 23rd and 29th (details here), is part of the Michelangelo Antonioni season at Close-Up Cinema. You can find full details here.
Chicago Reader review:
'Though Michelangelo Antonioni's only American film was very poorly received when it was released in 1969, time has been much kinder to it than to, say, La Notte, which was made a decade earlier. Antonioni's nonrealistic approach to American counterculture myths and his loose and slow approach to narrative may still put some people off—along with the uneven dialogue (credited to Fred Gardner, Sam Shepard, Tonino Guerra, Clare Peploe, and the director)—but his beautiful handling of 'Scope compositions and moods has many lingering aftereffects, and the grand and beautiful apocalyptic finale is downright spectacular. With Mark Frechette, Daria Halprin, and Rod Taylor.'
Here (and above) is the famous explosive finale.