The Triple Feed antenna is a directional circularly polarized antenna. Good radiation efficiency. Most FR4-based patches have terrible efficiency because FR4 is lossy at 5.8 GHz. Good axial , not just directly perpendicular to the also off-center. Cheap and easy to manufacture with high accuracy, even for a hobbyist. 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 : Less than 1.3 Antenna gain: 9.4 dBi Half power beam width: 55 (horizontal and vertical) Radiation efficiency: 83.5% Colour:As shown Material:Plastic + Metal Package Contents: 1 x Directional circularly polarized antenna(RP SMA Bore) 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.