A triple layer X-band FSS is designed and its reflection and transmission characteristics are explored for normal/oblique incidence. The proposed planar FSS is confirmed by simulation and measurement results. Then, by using the X-band FSS, a novel X-band radome is designed. Its reflection and transmission characteristics are investigated for in-band and out-of band frequencies by integrating an ultra-wide band antenna. A comparison of radiation patterns at selected frequencies for cases with and without radome is examined. Adaptation of radome to the antenna is achieved without significant reduction in radiation performance at the design frequency of FSS.