The Arduino core that we will be releasing (mid-January) for the Grasshopper and other CMWX1ZZABZ-embedded devices like our Cricket Asset Tracker and LoRa Sensor Tile (see above) will allow the user to trivially select the frequency band and everything else needed to configure the LoRa radio for point-to-point or LoRaWAN service.
Please do learn how to make use of the tools ST provides for their dev boards, but for Grasshopper et al using the Arduino core will be the easiest, lowest-power, and most efficient method to program the CMWX1ZZABZ for LoRa use.
The on-board pcb antenna of the Grasshopper was specifically designed to be rather wider band than necessary just for US use with the intention of making it usable for people in many locations, including Australia and New Zealand. You can always use a whip antenna or pole antenna using the uFl connector on the board. The on-board chip antenna is well-matched to the 860 - 930 MHz output of the Murata module.
Not sure if this answers whatever question was being posed, but if not please ask again!