@lpeter 

The only way to raise the transmit power from the router is from AXE75 WebGUI setting:

There's no option for changing the Wi-Fi region implemented.

  @lpeter 

Wireless signal power varies by region due to differing governmental regulations on maximum transmit power, with locations like the U.S. allowing higher power levels than the EU.

In the USA, unlicensed wireless devices operating on common Wi-Fi bands (2.4 GHz and 5 GHz) are regulated by the FCC to prevent interference. Manufacturers must obtain FCC equipment authorization for these devices, which often limits the Effective Isotropic Radiated Power (EIRP) to 36 dBm (4 watts) for Wi-Fi, while the maximum transmitter output power to the antenna is typically 30 dBm (1 watt).

Wireless transmit power in the EU is not a single value but varies by frequency band, with different limits for Indoor (I) and Outdoor (O) use, and for Very Low Power (VLP) and Low Power Indoor (LPI) devices in the 6 GHz band. For example, in the 5 GHz band, limits range from 23dBm (200mW) in some channels to 30dBm (1W) in others, while 6 GHz devices have a 14dBm (25mW) outdoor limit but a 250mW (24dBm) indoor limit for Very Low Power (VLP) devices.