The CI 118 antenna is a three-through-hole-mount style blade marker beacon antenna with a BNC port. It features a 75 MHz frequency that supports high-sensitivity marker beacon receivers and a thin profile suitable for bottom mounting with both light and heavy fixed-wing single-engine, multi-engine, and business jet aircraft. This antenna is encased in an aerodynamic molded polyurethane shell that is designed specifically for high-performance aircraft applications and is Skydrol and rain erosion resistant.