I, (with the gracious help of Jack Christensen) developed a prototype that allows a RF network of modules. The system is composed of a wireless central hub, and two wireless transmitters. The transmitter modules indicate their signal strength from the central hub by a series of LED bar graphs that increase and decrease as the signal weakens/strengthens. The central hub displays on an LCD each individual transmitter modules signal strength.
This network allows a rough translation of “distance” from the transmitter modules to the hub.