ey 1 to 23 megacycles, The transmitting and receiving antennas and the ground plane were in mutual perpendicular planes with the plane of the transmitting antenna oriented 53 degrees to the Fast of Magnetic North. 2. Ionosphere recorder site (C-97 airplane) a, Same as for Rongerik and Kusaie, except that a C-3 Ionosphere recorder was used. This recorder is the same as the C-2, except for a few modifications ani improvements. b. The transmitting antenna in the C-97 was a single wire delta fastened to the lateral extremities of the tail assembly. CPFRATIONAL Ground stations at Rongerik and Kusaie, using 15 second sweep operated on normal 24 hour schedule, 5 sweeps per hour until H-15 min; thence once a minute until H # 8 hrs; thence routine. Stations operated on C £1 and C ¢ 2 days the same as on C day. Airtorne Station C-97: Routine operation until H-15 min using 30 second sweep time; thence continuous until approximately H # 5 hours. RESULTS (gael — SOPIED/DUE » LANL RC