Final answer:
The RT-1523 can be used as a VHF Base Station in the MANPACK configuration, which is part of the SINCGARS radio systems utilized by the U.S. military.
Step-by-step explanation:
The configuration of the RT-1523 that can be used as a VHF Base Station is the MANPACK configuration. The RT-1523 is a series of radios utilized by the U.S. military and is part of the SINCGARS (Single Channel Ground and Airborne Radio System) family. The MANPACK version (which can be referred to as an RT-1523 configuration) is a portable unit that can be easily adapted for field use or set up in a fixed location to serve as a base station. Other configurations mentioned, such as the VRC-91F, VRC-110, and URC-200 are designed for different purposes and deployment scenarios; they do not serve as VHF Base Stations in the way the MANPACK configuration does.