This antenna is Celluteq's CE1070-N20 horn antenna. The key specifications are as follow.
Frequency range: 5.38GHz - 8.17GHz
Waveguide type: WR-137
Norminal Gain: 20dB (see plot for gains at different frequency points)
Beamwidth: 7.05GHz, E-plane: 15 degree; H-plane: 16 degree
VSWR: <1.5
Connector: N-F
Dimension: 325mm x 197mm x 153mm (12.8in x 7.8in x 6.2in)
Other models of horn antennas are also available, contact Celluteq Electronics for details.