TrueRC LINE-AIR 900 Linear Directional Antenna (SMA)

The TrueRC LINE-AIR 900 is a linearly polarised biquad directional antenna for the ground end of a 900 MHz control link, such as an ELRS 868/915 MHz or TBS Crossfire transmitter module. Its 10 dBi gain pushes the link further in one direction, which suits long-range fixed-wing and multirotor pilots flying out from a fixed launch point.

Key features

• Biquad element with 10 dBi gain and 99% radiation efficiency
• 68° half-power (-3 dB) beamwidth; across about 120° it still reaches at least as far as an omni antenna
• Linear polarisation to match the dipole or T-antenna on a 900 MHz receiver
• SMA male connector for direct fitting to an SMA-female module port or extension lead
• Rear 1/4-20 flush thread fits a standard camera tripod or light stand for aiming

Specifications

• Frequency: 900 MHz ISM band
• Gain: 10 dBi
• Polarisation: Linear
• Radiation efficiency: 99%
• Beamwidth (-3 dB): 68°
• Dimensions: 222 x 222 x 45 mm
• Weight: 224 g
• Connector: SMA male
• Mounting thread: 1/4-20

Rotate the panel so its polarisation matches the receiver antenna on the aircraft; crossed linear antennas lose a large share of signal. Keep the face pointed at your flying area, as gain falls away quickly outside the beam.