Antenna pattern for four gravitational wave antennas

The antenna pattern is analysed for four widely spaced cryogenic gravitational wave antennas which are expected to begin operating in coincidence during 1987. Using reasonable assumptions for sensitivity, the four-antenna pattern is shown to give between 50% and 80% sky coverage for circularly polarized radiation under the minimum-detection criterion of two-way coincidence. One-hundred percent sky coverage can be acheived if one antenna is reoriented, but this is at the expense of reduced probability for 3-way coincidences