System and methods are provided for a passive transmitting antenna for a magnetic resonance tomography system and to a system including a passive transmitting antenna and magnetic resonance tomography system and a method for operation. The passive transmitting antenna includes a tuning apparatus with a tuning element. The tuning apparatus is configured to perform a tuning of the passive transmitting antenna as a function of a relative position of the passive transmitting antenna in a patient tunnel of the magnetic resonance tomography system.