Abstract: An aircraft-crash location transmitter tuned to transmit on standard emergency frequencies is shock mounted in a sealed circular case retained in a recess atop the tail of an aircraft by means of a shear pin designed to fail under a G-loading associated with a crash situation. The antenna for the transmitter is a metallic spring-blade having a curved cross-section and coiled like a spiral spring around the outside of the circular case, the free end of the antenna abutting the surface of the recess when the case is retained therein by the shear pin for maintaining the antenna in a furled state. A battery within the case for powering the transmitter is kept trickle-charged from the electrical system of the aircraft through a break-away connector on the case that also serves to mechanically hold-open the transmitter key until the connector separates.