[Milsurplus] Whatizit? CU-168/FRR?

[Kenneth G. Gordon]

Antenna coupler. For general radio use. Has 5 "N" connectors 
coming out of 5 separate boxes and a built-in power supply.

What is the frequency range? Would it work well at VLF or is it only 
for HF? Are there pre-amps in it? How good is the separation 
between receiver outputs? Where is the antenna input? Is it worth 
anything? It is NIB, but no manual.

I would like to use it with my MF and VLF receivers on a single, 
low-noise, active antenna for receiving.

Ken Gordon W7EKB