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