Here are some commercial grade options:
30 Degree Directional Antenna
(902MHz-940MHz):
http://www.mpantenna.com/product/30-degree-900mhz-high-gain-directional-sector-antenna-nlos-08-ant-0910/
60 Degree Directional Antenna
(902MHz-940MHz):
http://www.mpantenna.com/product/60-degree-odas-das-directional-sector-cellular-lte-high-gain-08-ant-0934/
120 Degree Directional Antenna
(902MHz-940MHz):
http://www.mpantenna.com/product/120-degree-900mhz-directional-sector-antenna/