MenaceRC AeroPOD 5.8GHz 90° MMCX Wing Antenna - RHCP

As far as I can tell this is the only antenna out there for RC planes that is made for Aerodynamics. The teardrop shape of the plastic cover is optimally designed for aerodynamic flow. Does the job and admirably.

I know it seems counterintuitive but it must be said; the pointy part faces the tail, the flatish part faces the nose. The trailing edge is where the teardrop shape reduces drag. If you mount it backwards, you are introducing drag to your design and the whole thing was for nothing.