The GD2100 from Chelton is a SATCOM Antenna with Frequency 244 to 318 MHz (UFO) / 300 to 380 MHz, Tx Frequency 292 to 320 MHz, Rx Frequency 244 to 380 MHz, Gain -3 to 0 dBi, Input Power 200 W. Tags: Helical. More details for GD2100 can be seen below.