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This paper proposes the compact antenna for server node of wireless sensor network system. The antenna parameters are varied to achieve the nearest horizontally polarized omnidirectional pattern. The overall antenna width, length and height are fixed for suitable installation. The antenna structure is simple and its design is straightforward. The return loss, radiation pattern, absolute gain and cross-polarization are simulated and measured. The measured return loss is equal to -21 dB at the operating frequency with the measured bandwidth of 1.85%. The maximum azimuth ripple is lower than 10 dB. This antenna can be useful for a server node of WSN with applications to ITS that desires small-size antenna.