121.5 & 243 MHz The DG ELT10-214-2 is an externally mounted Emergency Locator Transmitter (ELT) rod antenna which operates on the 121.5 MHz and 243.0 MHz emergency frequencies. The antenna is supplied with a 5 foot RG58C/U coaxial cable which is terminated with a male BNC connector. The antenna is constructed of fiberglass and epoxy material, and the internal components are foamed in place to avoid problems incurred during aircraft shock and vibration.