Feature: The antenna has a female-rp-sma connection wire, so it can be easily connected to the gateway and all other helium miners. The antenna can be used in any environment that requires LoRa long-distance connection, for agriculture, environmental monitoring, and urban monitoringLow VSWR:The VSWR of this antenna is 1.1, which is lower than other similar antennas (the closer the VWSR is to 1, the lower the reflection and better the antenna match)How to Choose dBi? Lower dBI: Excellent performance on uneven terrains or hotspot high density areas. Higher dBI: excellent performance on flat terrain and low hotspot density. Middle dBI: ideal for those enorments that enter among others the enviorments described above. What is the rated profit and maximum profit? Rated gain refers to the stable value that the antenna can achieve under normal conditions, and maximum gain refers to the maximum value that can be achieved with the lowest loss and the best environment, but this value is not a fixed value, and the gain often fluctuates. Specification:Brand: STARF Frequency: 860-930MHz (eu 868MHz, usa 915MHz)Maximum Gain: 5.8 dbi (not fixed value)Rated Gain: 4 dbiPerformance: ge; 60%Radiation mode: omnidirectionalMaximum input power: ge; 2WPolarization: Linear/Vertical Polarization Impedance: 50 ohm Material Cooler: CUM Material Plastic: FRP (White Light) Cable Type: RG58Connector Type: Female to RP-SMA Cable Length: 1m Package List:1 * Fiberglass Antenna KitNote:Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Manual measurement, please allow 1-10mm error. Thank you for your understanding.