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In this paper, the wideband planar sleeve antenna with two sleeves on the upper side and two sleeves on the bottom side are analyzed numerically. In the previous study, the wideband planar sleeve antenna is used at frequency 3.5GHz. The purpose of this research is addressed to analyzed the wideband planar sleeve antenna in the range frequency of 400-4000 Mhz by using WIPL-D EM Simulator by adjusting the antenna parameter. The antenna upper sleeve, lower sleeve, the length of the antenna and the distance between the lower and upper sleeves are adjusted. The result shows that the wideband planar sleeve antenna is achieved. When the length of the upper sleeve is increased, the antenna will work on lower frequency but the return loss slightly reduced, the same effect will be gained by increasing the lower sleeve size, but its not affecting the lower frequency. When the antenna length is increased, the return loss of the antenna is reduced. Furthermore, the distance between lower and upper sleeve affects the return loss characteristic. This is indicated that by adjusting the length of the antenna parameter, the antenna is applicable for many systems, such as television system and the ISM system.