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In this paper, a research on coastal Radar to support C4ISR (Command, Control, Communications, Computers, Surveillance and Reconnaissance) was carried out.This coastal Radar has an advantage of easy to be transported in order to observe seas/coastal areas in different locations. The Radar technology used in this research is FM-CW (frequency modulated continuous wave) with a S-band working frequencies, where this type of Radar has a LPI (low probability of intercept) capability. In this paper, the presentation is on antenna and hardware development, while the radar software is currently still on progress for the installation. The Radar consists of antenna system (dual antenna), an antenna moving parts (stator + motor), the high frequency part of RF (radio frequency), power supply, rotary joint for connecting between the RF with antenna, down converter to convert the signal RF to IF (intermediate frequency), power splitter 3-1 and 1-3 serves as a multiplexer and de-multiplexer. The mux/de-mux connects to the signal processing part of IF, part of the data processing and Radar signal, and the Radar display. The designed and fabricated antenna system produces bandwidth of 61.25 MHz, VSWR at 3 GHz = 1.303, one degree of horizontal angle and vertical angle of 19.6 degrees. The measurement results show a similarity between the designed and the measured antennas, i.e., the vertical beamwidth <20 ° and antenna gain array of 27.52 dBi.

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