Features: The Triple Feed Patch antenna is a directional circularly polarized antenna. Good radiation efficiency. Most FR4-based patches have terrible efficiency because FR4 is very lossy at 5.8 GHz. Good axial ratio, not just directly perpendicular to the patch but also off-center. Cheap and easy to manufacture with high accuracy, even for a hobbyist. Specifications: type: SMA Center frequency: 5.8 GHz Bandwidth: 660 MHz (5.47 - 6.13 GHz) Matching: S11 Less than -20 dB, VSWR Less than 1.22 (at center frequency) Axial ratio: Less than 1.3 Antenna gain: 9.4 dBi Half power beam width: 55 (horizontal and vertical) Radiation efficiency: 83.5% The appearance and color of different batches of products may be different, which will not affect the use. Material: Metal colour: Black Package Contents: 1 x Antenna 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.