Abstract: Tumor Treating Fields (TTFields) therapy is a proven approach for treating tumors using alternating electric fields. When treating tumors in certain anatomic locations (e.g., at certain locations within a subject's head) it may be beneficial to induce an electric field through the subject's body with an overall directionality that varies between more than two directions. The embodiments described herein can induce electric fields in many different directions by simultaneously applying AC signals to different pairs of transducer arrays and adjusting the amplitudes of those AC signals.