The ST0543-00-401-U from Amphenol RF is a GPS/GNSS Antenna with Frequency 1574.42 to 1576.42 MHz, Gain 2 dB, Efficiency 0.8 %, Impedance 50 Ohms, Axial Ratio 3 dB. Tags: Embedded, Low Profile, Ceramic. More details for ST0543-00-401-U can be seen below.