The VLF transmitting antenna has a large structure, but its size is still a small electric antenna compared with the wavelength. Its radiated resistance is small, and the loss resistance of the antenna has a great influence on the radiation efficiency of the antenna. The loss of antenna mainly comes from the ground loss resistance. The theoretical calculation formula of the loss resistance of the monopole antenna is analyzed, and the key parameters that need to be considered in the design are analyzed. The numerical simulation method is used to verify the example of a thirteen tower antenna.