Type Acitve Antennas Module External Active Antenna Module Dual Shark Antenna Module TDMB Shark Antenna Module External Active Antenna Module / Specifications Part No. Antenna Size[mm] Frequency [MHz] LNA Gain[dB] Noise Figure[dBi] Polarization VSWR GPS SAL-2.8GA404 25x25x4 1575.42+1.023 22 [Typical] 1.0~1.6 RHCP 2.0:1 [Max] SDMB SAL-2.8DA-301 25x25x3 2642 22 [Typical] 1.0~1.6 RHCP 2.0:1 [Max]