VHF radiation source location measurements using an interferometric technique are presented for a single stroke cloud-to-ground lightning discharge. The discharge began with 100 ms of preliminary activity during which several horizontal streamers developed inside the cloud, one of which culminated in the development of a negative leader to ground and a return stroke. The return stroke was followed by a 10 ms quiet period in the radiation and by a single, fast 'k-type' event which appeared to transport negative charge horizontally into the region of initial breakdown, completing the flash. ¿ American Geophysical Union 1989