Antenna pattern measurement by satellite

The satellite 1959 IOTA (Explorer VII) which emitted a signal on 19.991 Mc was used to measure the radiation pattern of a large multiple-beam antenna array (ISCAN) when it passed over the array. The experience gained in the improvised tests is projected into future, well-instrumented pattern measurements by means of a satellite designed for this purpose. It appears that the "antenna calibration satellite" envisioned has definite merits as well as limitations.