The broad objective of the two radio frequency (RF) in situ experiments of January and March 1980, were as follows: Gain field experience with the IITRI RF in situ process for oil shale. (All previous tests had been in the laboratory.,11917 ); 2. Demonstrate RF heating in situ of a portion of the shale volume having a mass some eight times as large as the largest laboratory resource sample (2000 kg vs. 250 kg).; 3. Demonstrate RF heating in situ of a portion of the shale volume to pyrolysis, as evidenced by temperature measurements and the recovery of a significant fraction of the Fischer assay within the pyrolyzed volume.; 4. Obtain data concerning the electrical and chemical properties of the test shale during RF heating and oil production.; 5. Collect sufficient field data to better understand the RF heating and product recovery processes, and to plan future tests.