Product Review

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.
  Description:
Cheap and easy to manufacture with high accuracy, even for a hobbyist.
  Specifications:
Center frequency: 5.8 GHz
Bandwidth: 660 MHz (5.47 - 6.13 GHz)
Matching: S11 < -20 dB, VSWR < 1.22 (at center frequency)
Axial ratio: < 1.3
Antenna gain: 9.4 dBi
Half power beam width: 55° (horizontal and vertical)
Radiation efficiency: 83.5%
Weight:20.7g
Color: black
Package Included: 
1 x 5.8GHz FPV Antenna Triple Feed Patch
1 x semi-rigid coax (SMA male - SMA male)