In a square office where coverage is needed in all directions, an omnidirectional antenna is the best choice. This type of antenna radiates radio frequency (RF) signal equally in all directions horizontally, which would provide uniform wireless coverage throughout the office space. Directional antennas, on the other hand, focus the RF signal in a specific direction and are not suitable for this scenario. Polarized and Yagi antennas have specific applications that do not match the requirement of uniform coverage in all directions.