The fabricated antenna has been measured in the inside an anechoic chamber of the wireless communication research group, KMUTNB to obtain the radiation patterns for the center frequencies for the lower band (f 01 = 8.5 GHz) and the higher band (f 02 = 11.5 GHz). The measured radiation patterns are plotted to compare with the simulated results, as shown in Fig. 5. It can be seen that the H-plane horn exhibits good agreement in terms of radiation pattern in H and E plane orientation. The performance of the H-plane horn is summarized for both H and E planes and presented in Table 1. The antenna shows a good performance for the 3 dB beamwidth of H-plane that is smaller than E-plane as about 73 degrees in simulations and 70 degrees in measurements. It is due to the large aperture size on H-plane which is related to the radiation performance. The cross polarization levels in H-plane are average larger than E-plane as around 30 dBi in the simulation and measurement shown in Table 1. Table 1 Summary of the H-plane horn performance. Orientation plane