Features: High gained designs: provides excellent signal reception and transmission performances, significantly improves signal stability during long-distance flight, ensuring reliable control of the quadcopter over longer distances. Wide compatibility: for many types of traversers and quadcopters, with strong adaptability to meet the needs of different brands and models. Lightweight construction: lightweight it not increase the burden of the quadcopter and maintains the best flight performances, suitable for long-time flight use. Strong durability: with impact resistance, highly temperatures resistance and waterproof performances, it adapts to various climatic conditions and ensures that the device works normally in harsh environment. Frequency ranging: Supports 2.4GHz band, which meets the operating requirements of most UAVs and remote control devices and ensures efficient signal transmission. Specifications: Item：2.4GHz ELRS Antennas Frequency :2400.0MHz Efficiency :-2.94dBi Gained:4.18dBi Efficiency (%):50.77% Directionality :7.12dB position :0.00Theta position :270.00Phi Weight: 5.83g. Type:SMA Size：about 69x45mm/2.72x1.77in Types：External threaded inner needle/External threaded inner hole/Internal threaded inner needle/Internal threaded inner needle Package Includes: 1PC 2.4GHz ELRS Antennas note: There might be a bit color distortions due to different computer resolution There might be size errors due to different computer resolution