Patch antennas are widely used to connect communications with unmanned aerial vehicles (UAVs). Because of the asymmetrical broadcast and reception patterns used, these systems may maintain radio communication with one another even when the vehicle is positioned in a variety of off-center orientations. This study presents an exploratory evaluation of a patch antenna concept for underwater UAVs. Underwater UAVs have gained attention for their potential applications in marine research, underwater exploration, and surveillance. However, maintaining reliable communication with these vehicles has proven challenging due to the limitations of underwater communication systems. In this research, a patch antenna design specifically optimized for underwater UAVs is proposed and evaluated. A microstrip-fed architecture’s other advantages include portability, low cost, and the opportunity to have a three-dimensional structure that is seamlessly integrated into the fuselage. In this work, we characterize the operational parameters of a patch antenna designed for a video downlink operating at 6.3 GHz. The patterns of the near field are discussed here, in addition to the physical shape, bandwidth, and return loss. The model operates on a frequency range close to 6.3 GHz when using the electromagnetic module (emw) in both stationary and parametric experiments within COMSOL 5.6. Our simulation results show an increase in frequency often results in an increase in efficiency, which peaks at 6.24 GHz with an efficiency of 0.9, indicating that 90% of the input power is radiated. The results of the evaluation demonstrate the feasibility and effectiveness of the proposed patch antenna concept for underwater UAVs. The antenna exhibits favorable radiation patterns, good antenna efficiency, and a satisfactory communication range.