ECHO 2 2.4 GHz GSM/GPRS/3G/4G PCB Antenna, Siretta. The ECHO 2 PCB Antenna from Siretta provides you with a quad band, GSM, GPRS, 3G and 4G solution for your designs. Features ; Benefits of the ECHO 2 PCB Antenna GSM/GPRS 850, 900, 1.8, 1.9 MHz 3G 1.9, 2.1 MHz 4G 900, 1.8 MHz ISM 868, 2.4 MHz Ground plane independent Various cable and connector options -40°C to +85°C operating temperature range 50 ohm impedance 2 dBi peak gain Vertical polarisation wave dipole radiating element Dimensions: 75 x 25 x 1 mm