Abstract: To thoroughly understand the radiation characteristics of very low frequency (VLF) antennas in magnetized plasma and provide a theoretical foundation for ionospheric spaceborne VLF experiments, this study established a VLF antenna radiation model based on the finite-difference time-domain (FDTD) method. This research systematically investigated the antenna's radiation characteristics by analyzing the radiated energy distribution, radiation patterns, and wave modes. The results demonstrate that the radiated energy propagates along the magnetic field lines, forming a typical resonance cone structure. The deviation of the radiated energy flow from the background magnetic field direction is confined within the Storey limit angle. Furthermore, as the magnetic dip angle increases and the antenna axis aligns more closely with the background magnetic field, the radiated energy weakens significantly. Under the given electron density and background magnetic field conditions, the edge of the resonance cone exhibits right-handssss elliptical polarization, indicating that the whistler mode dominates this region. This study not only helps clarify the radiation behavior of VLF antennas in magnetized plasma but also provides a theoretical reference for spaceborne VLF experiments in the ionosphere.