Before revision: Conformal antennas were developed in the 1980s as avionics antennas embedded in the curving skin of military aircraft in order to reduce aerodynamic drag , replacing conventional antenna designs which project from the aircraft surface .
After revision: Conformal antennas were developed in the 1980s as avionics antennas embedded in the curving skin of military aircraft , in order to reduce aerodynamic drag , replacing conventional antenna designs which project from the aircraft surface .