4 Line Cordless Business Phone System offers Long Range
You can extend the range of the AT&T SB67138
system by adding optional repeaters which enable callers to roam up to 2,850 feet away from the base station while on a call.
Each repeater can be chained together (one repeater can repeat another repeater's signal) to offer incredible range all with no wires.
We offer a number of SB67138 bundles to choose from or create your own at:http://www.smithgear.com/4-line-cordless-phone-systems.html