An antenna is picked to match the frequency the device works on: 868 MHz for LoRa sensor networks, 824–960 and 1710–2170 MHz for GSM, a wider band for 5G NR modules. The second figure is the gain in dBi: short 2 dBi antennas suit use right beside the device, while 10–12 dBi rods, 130–150 cm long, are for reaching a distant point. Beside the antennas themselves you will find magnetic mounts and lightning surge protection.
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An antenna is picked to match the frequency the device works on: 868 MHz for LoRa sensor networks, 824–960 and 1710–2170 MHz for GSM, a wider band for 5G NR modules. The second figure is the gain in dBi: short 2 dBi antennas suit use right beside the device, while 10–12 dBi rods, 130–150 cm long, are for reaching a distant point. Beside the antennas themselves you will find magnetic mounts and lightning surge protection.