The Line-AIR 900 is TrueRC's compact redesign of the biquad antenna, delivering 10 dBi gain in less than half the typical size. A 1/4-20 mounting point on the back makes it easy to attach to your ground station.

This is a VERY High gain antenna, Use for Long range flight ONLY. 

Specifications

• Frequency: 900MHz ISM band
• Gain: 10 dBi
• Polarization: Linear
• Radiation Efficiency: 99%
• Beam-width*: 120°
• Beam-width @-3dB**: 68°
• Connector: SMA male
• Dimensions: 222mm × 222mm × 45mm
• Mounting: Standard 1/4-20 flush thread
• Weight: 224g

*Coverage where reception is at least equivalent to an omni.
**Coverage where at least 70% of the max range is obtained.