The Sniper V1 antenna consists of modifying a crosshair antenna and adding director elements. It is the same principal you find in a Yagi antenna, but keeping the circular properties that benefit FPV. In short the director acts as a "lens" which raises the gain by 3.5dBi to reach 13.5dBi compared with a crosshair.

Specs

• Frequency: 5.8GHz
• Gain: 13.5 dBic
• Beamwidth: 80 deg.
• Beamwidth @ -3dB: 45 deg.
• SWR: 1.1:1 @ 5.8GHz
• Connector: SMA male
• Dimension: 3.5"x3.5" (SMA cable length of 2")