A projectile (12) carries a combination antenna (21), whose tuning corresponds to both the fundamental frequency of the radar (17) of a proximity fuse and the third harmonic of the carrier frequency of a satellite navigation receiver (20), in its replaceable tip (11) under its ballistic radome hood (14), so that both systems may be operated via this one combination antenna (21). For the decoupling, the radar range finder (18) is only put into operation when the navigation receiver (20) has been switched off because the projectile (12) has arrived over the target area on its corrected flight path.