Bird 5012D Frequency Range: 350 MHz - 4 GHzPower Range: 150 mW - 150 Watts Avg, 400 Watts PeakInsertion VSWR: <1.05 from 0.35 to 2.5 GHz, <1.10 from 2.5 to 4 GHzInsertion Loss: <0.05 dB from 0.35 to 1.0 GHz, <0.1 dB from 1 to 4 GHzDirectivity: 30 dB up to 3.0 GHz, 28 dB from 3.0 to 4.0 GHz Wideband Power Sensor (350MHz - 4GHz; 150mW - 150W Avg, 400W Peak) The Bird line of Wideband Power Sensors are designed specifically for worry-free field use.