Radio Frequency Systems unveiled the Optimizer APXVx56516 antenna series, an IEEE 802.16 WiMAX-compliant solution set that includes antennas, RF conditioning and in-building solutions. The dual-polarized WiMAX antennas are available in variable and remote electrical-tilt versions that cover the 2.3 to 2.7 GHz and 3.3 to 3.8 GHz frequencies, according to the company.