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In this article, a new low-cost active antenna for WLAN sensor applications is presented. The proposed system operates as a transceiver whereby the received coded data signal from the broadside direction is retransmitted over a wide area in other directions. This is performed so that a null response at the main pointing angle is maintained. It is formed by a three elements series array connected to high-performance FET-based down-and up-converters. The performance of the proposed architecture is verified using experimental results.ABSTRACT: This article reports a modification of two-strip monopole antenna, which was an undergraduate final year project. The modified antenna uses a thicker substrate when compared with the original design while maintaining the monopole radiation characteristics at the WiFi frequency bands of 2.4 and 5 GHz. One of the significant improvements of the antenna is the inclusion of the mobile WiMAX frequency band at 3.5 GHz.