desired vertical angle over all of the operating frequency range from @ 1 to 23 megacyclea, The transxitting and receiving antennas and the ground plane were in mutual perpendicular planes with the plane of the transmitting antenna oricnted 53 degrees to the east of magnetic north. lonosphere recorder site (C-97 aircraft) " 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 and improvements. The tranamitting antenna in the C-07 was a single wire delta fastened to the lateral extremities of the tail assembly. OPERATIONAL Kusaie: Routine operation until H-15 minutes; thence once per = minute until H + 22 minutes: thence twice per minute, alternating the receiving and transmitting antennas at the end of each 15 second aveep, until approximately H + 92 minutes; thence once per minute until H + 8 hours; thence routine, Rongerik: Routine until H-15 minutes, thence once per minute until EH ¢ 8 bours; thence rcutine, C-97 Airborne Station: This station successfully participated in this test and sore data were obtained. Recorded data for this station has not been available for review at the time of this writing due to the planes return to Hickam AFB for maintenance, RESULTS All stations operated successfully for this shot, Kusaie: At H +17 minutes a pronounced disturbance, sirilar to tmt a observed during (Cherokee) and Zuni), was observed in Ss j the FP region apparently moving towards Kusaie at about the height of the \ | NL 30