Found this on the website.
On which frequencies does goTenna Mesh operate?
The first-gen goTenna works on the 151-154MHz band (MURS), whereas goTenna Mesh will transmit at 1 W on 902-928 MHz in the United States, and will vary throughout other countries. For example: goTenna Mesh will transmit at 0.5 W on 869.4-869.65 MHz in Europe and other CE countries, and the device will auto-tune itself to the appropriate frequency band and power output based on the location where it's being used.