Feature: 1. ACCURATE FREQUENCY: This antenna has a precise and better lock frequency, which decreases the performance of signal attenuation. 2. HIGH FREQUENCY: The high frequency characteristic of this antenna reduces work difficulty and increases work efficiency. 3. PCB MATERIAL: This antenna is made of PCB material, approx 1.6mm / 0.063in thick double sided board, and full tin spraying process. 4. GOOD PASSING PERFORMANCE: This antenna can ensure good passing performance of large and small currents. 5. 1090MHZ FREQUENCY: This is an active receiving antenna with a frequency of 1090MHZ, which improves the signal to noise ratio. Specification: Item Type: Antenna Material: PCB Gain: 2.0dBi Frequency: 1090MHZ Interface: SMA Female. Package List: 1 x Antenna Note: 1. Do not use over pressure2. Please allow 0‑1mm / 0‑0.04in error due to manual measurement. Thanks for your understanding.