We've gone through several baby monitors. The ones that we had with our two older kids always got a lot of interference, or tended to pick up our neighbors cordless phone conversations. The interference got so bad that we usually turned the volume down all the way.
The Fisher Price Private Connection monitor is the best baby monitor that we have had. We hain't had any problems with interference. Also, the reception has been great even through multiple floors.
[via modern day dad]