1. Support 9.9Khz-181mhz frequency reception, receive directional, can rotate antenna to find best receiving Angle. 2. Easy Installation and User-Friendly Operation: Our circular antenna is designed for effortless installation and simple operation, ensuring that users can quickly start using it without any hassle. 3. Compact and : Our antenna is compact and , making it convenient to carry and store when not in use. 4. Premium Materials for Durability: Our loop antenna is made with high-quality materials, ensuring durability and a long lifespan, providing users with sustained performance. 5. It can be applied to malachite SDR receiver, TEF6686 receiver, HAM radio connection, etc Frequency range: 9.9khz--181mhz Interface: SMA pin interface Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Blue Material:plastic Package Contents: 1 x Small Ring Antenna Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.