The ST0543-00-402-U from Amphenol RF is a GPS/GNSS Antenna with Frequency 1574.42 to 1576.42 MHz, Gain 2.5 dB, Efficiency 0.72 %, Impedance 50 Ohms, Axial Ratio 4 dB. Tags: Embedded, Low Profile, Ceramic. More details for ST0543-00-402-U can be seen below.