The APAKC2506A-SG3 is a compact multiband active GNSS patch antenna designed for simultaneous reception of GPS-L1, Galileo-E1, BeiDou-B1, and GLONASS-L1 signals across the 1555–1615 MHz frequency band. It features an integrated low-noise amplifier (LNA) with a gain of 32 ± 2 dB at 25 °C, right-hand circular polarization (RHCP), and 50 O impedance. The antenna element provides typical gains of -1.5 dBi (GPS-L1/Galileo-E1), -1.0 dBi (BeiDou-B1), and -2.5 dBi (GLONASS-L1), with a maximum VSWR of 1.5 for the antenna and 2.0 for the LNA output. The LNA operates at 1.5–3.6 V DC with a typical current draw of 8.5 mA and achieves a noise figure of 1.1 dB. Housed in a compact 25.0 × 25.0 × 6.9 mm ceramic package with an RF coax cable and IPEX-II connector, it operates reliably from -40 °C to +80 °C and is ideal for IoT, M2M, geofencing, surveying, mapping, and logistics applications requiring multi-constellation GNSS positioning.