Do not allow receiver antennas to touch each other. Keep antennas away from metal objects, including cables, pipes, cabinets, scaffolds and the supports for acoustic ceiling tile. Make certain that wireless equipment is well maintained. After a long period of use, wireless receivers can lose sensitivity and the power from transmitters can drop. If range is not what it once was and there is no other obvious cause, consider having the system serviced.
Additional information is available at Maximizing Range .
Certain Types of Interference can also cut range considerably. See also Quick Tips - Avoiding Interference and Resolving Interference Problems to learn more about this potential problem.