These are genuine FPV Focus 5.8GHz panel-antennas that have been engineered to maintain high video and audio clarity for very long distances (3KM+ with only a 200MW transmitter.) They are rated at 11dB and are typically used for medium to long-range flights, and as such, its important the antenna is pointed in the general direction of the Video Transmitter. Please note that 5.8Ghz is susceptible to Humidity, Obstacles and other RF noise. This can affect the performance of any antenna. These panel-antennas are directional, should be mounted on the receiver only, and should always be pointed at the aircraft when possible. It is best used when combined with a 5.8GHz Clover Leaf Omni-Directional Antenna on the video transmitter.