Human body communication (HBC) technologies have vast potential in the healthcare landscape. This work focuses on Magnetic Human Body Communication (MHBC), supporting for the first time that this technique is more efficient when planar inductors are used as transceivers. A systematic study was performed to establish the most appropriate way to excite the signal into the human body to improve the channel usability and provide a design criterium for transceiver designers. Furthermore, a physical-based model is proposed and tested against channel measurements, obtaining excellent experiment-model correlation at frequencies up to 20 MHz.