Nighthawk LTE Mobile Hotspot Router Extender/Repeater ??

Is there an extender that works with the Nighthawk LTE Mobile Hotspot Router?

Here's the application: The router will need to sit in a school lobby, becasue if we move it to the center of the building, it loses signal. However, we have station in the back of the building that need to connect, so we need to extend (or repeat?) the connection through the building toward the back of the building.

Any advice?