Our hotspots ship with an appropriate antenna for the region they are deployed:
US and Canada (US915): 902 - 928 MHz Peak Gain: 2.3 dBi
Europe (EU868) 863 - 870 MHz Peak Gain: 2.8 dBi
You may access it on this link for more details on Antenna Specifications. For increased range and mining potential, consider aftermarket antenna options if appropriate for your deployment.
Updated