The HC977 from Tallysman Wireless is a GPS/GNSS Antenna with Frequency 1160 to 1255 MHz / 1559 to 1606 MHz, Gain 1 to 2.7 dBic, Noise Figure 1.6 dB, Power 22.7 to 25.1 dBm, Voltage 2.2 to 16 V. Tags: Helical, Helical. More details for HC977 can be seen below.