This antenna has a high gain and a narrow radiation angle, so it is suitable for long-distance communication. For short-distance communication, the transmitting antenna and the receiving antenna must be aligned. If they deviate from the radiation range, the communication effect cannot be achieved. It is suitable for long-distance image transmission remote control of flying drones. Specifications: Frequency bandwidth: 2.3GHz-2.65GHz Polarization mode: circular polarization antenna (left-hand) Impedance: 50Q Gain: 13dBi Radiation angle: 60 Maximum wave ratio: (2.4GHz-2.5GHz) Less than 1.2 Due to different batches, there may be differences in product appearance and printed text, which not affect use Specifications: A: Internal thread inner hole (left-handed) Colour: Black Material: PCB Package Contents: 1 x 2.4GHz Directional Antennas Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.