Radio Shack has a R.F.(radio frequency)intercom system that they sell for about $100.00.It will also accept their hand held units when they are set to the same channel and quiet code.
I have 2 of the wireless base stations and 2 hand helds and the sound quality is excellent.
I beleive that they refer to this as their F.R.S.or family radio system.It does not use the power wires as the transmission medium.
Chris
