Feature:1.This is an indoor omni-directional antenna with 5.8 dBi gain. Also included is a magnetic base.2.Compatible with RAK 2, Nebra Indoor, and Bobcat 300 and more.3.You can use the included magnet base with the factory antenna of any of these miners, or with the included 5.8 dbi antenna. As gain increases, your vertical path will decrease, allowing you to communicate with hotspots from a greater distance but reducing your ability to be in the path of closer hotspots. As your community experiences new miners over time, it may be necessary to adjust what antenna you are using to deal with the density.4.Use with your Nebra, Bobcat, or RAK miner to help increase your coverage area. This is an indoor antenna and not rated for outdoor use. We recommend placing this inside near-window, or in a more optimal place for sending and receiving than where your miner currently is. Specifications:Frequency range：868MHzGain：5.8dBiVSWR：lt; 2.5:1Polarization：VerticalDirectivity：Omni-DirectionalMaterial：ABS,CopperAntenna or：RP-SMA maleImpedance：50 ohmAntenna height：16 inchesBase diameter：2.5 inchesBase cable length: 11-foot shielded low loss cablePackage List:1*With base 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. Thanks for your understanding.