Wifi range extender

excuse me … it is my first attempt to write it down in english.
I want to use maybe the GL-X750 to user 4G and work like an access point.
How big is the range for the wifi signal outside?
Can i increase or extend the range of the wifi signal with bigger antennas?

Thank you for your tipps!

regards …

Based on tests, the routers can cover around 80-100 meters in open area. Generally, the Wi-Fi coverage in a house should be around 20-30 meters. Range will vary depending on things like walls, doors, foliage and other obstructions between the router and the end device.

The external antennas on the X750 are LTE antenna so changing them will not affect WiFi signal or range.

Thank you!
Is there a possiblity to apply other antenna for the WIFI signal?