A method and system for attaching a radio frequency identification (RFID) tag to an ordnance is provided. By tailoring the packaged tag and electronics to accommodate existing ordnance body cavities the integrity of the bomb casing is maintained. Likewise, fin assemblies also remain intact and are mounted in a conventional manner to the tagged ordnance. Numerous ordnance types, to include the mark (MK) 80 series general purpose bombs and equivalents are compatible with the tagging method and system described herein. Set screw mounted tail assemblies of various fin configurations are readily assembled onto the metal body casings of tagged ordnances. A curved dipole antenna provides access to external query signals and transmission of tag locating signals. As described herein, tag antennas can mount between ordnance assembly parts, adding to the ease of retrofitting existing ordnance inventory for a RFID tag localizing system.