This antenna is Celluteq's CE1100-N20 horn antenna. The key specifications are as follow.
Frequency range: 8.20GHz - 12.40GHz
Waveguide type: WR-90
Norminal Gain: 20dB
Nominal Beamwidth: 18 degree
VSWR: <1.5
Connector: N-F
Dimension: 107mm x 138mm x 245mm (4.2in x 5.4in x 9.6in)
Other models of horn antennas are also available, contact Celluteq Electronics for details.