... on your need 3.Receiving distance 4.Anti-interference yagi antenna Our Yagi antenna main material is Oxidation aluminum alloy , this material ... from acid rain, alkaline and salt fog corrosion. Advantages: The yagi antenna have strong directivity , high gain, signal stability, receiving distance ... :470-1100MHz (can select) Gain:7dBi,9.5dB,11dB,12dB,13dB,16dB. (can select) Front to back ratio:≥12dBVSWR ...