VHF/UHF 3 Frequency ELT SAR Antenna. 121.5/156.8/243MHz for Helicopter and Fixed Wing Up To 250Kts. 8.5 Fiberglass Bent Rod, 4-hole mount with Female BNC connector. 25W power handling. DO160 qualified 21-50-339VHF/UHF ELT Antenna | Bent Rod, 121.5, 156.8, & 243MHzThe 21-50-339 is an externally mount..