This article presents a structure-reused antenna that incorporates pattern and polarization diversities in dual wide impedance bands. The proposed antenna employs a surface waveguide-integrated partially reflective surface (PRS) with a positive reflection gradient. In the low-frequency band, a surface-wave antenna is designed to operate from 4.8 to 6.8 GHz, featuring linear polarization and quasi-broadside radiation. Such a configuration is well-suited for vehicle-to-everything (V2X) communication applications. Additionally, a circularly-polarized (CP) Fabry-Perot (F-P) antenna is developed for low-earth orbit (LEO) satellite communication, operating in X/Ku band (11.5 ∼ 14.3 GHz, 21.7%). This F-P antenna integrates a partially polarization-conversion ground (PPCG) and a partially reflective surface (PRS). It is worth noting that the surface-wave and F-P antennas share the same structure for their surface waveguide and PRS, respectively. Furthermore, the radiation source of the F-P antenna is utilized as the reflector for the surface-wave antenna. The design, principle, results, and applications are presented and analyzed, and the final antenna performance is validated.