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In this paper, a novel wide-band rhombus-like wide-slot antenna with an offset microstrip-fed line is proposed and studied. Impedance, radiation, and gain characteristics of this antenna are presented and discussed. From experimental results, the measured impedance bandwidth, defined by 10 dB return loss, can reach an operating bandwidth of 3230 MHz with the center operating frequency at around 4295 MHz, which is about six times that (~543 MHz) of a conventional microstrip-line-fed printed wide-slot antenna. The gain variations are also observed to be less than 3 dBi, with a peak antenna gain of about 4.5 dBi.