D.C.
We didn't use anything marketed as a baby video monitor. We used security cameras. They come with a camera and a receiver. We bought 2 sets, and they are identical, so both recievers work with both cameras. It is set up with a camera in each room, set on a different channel. We have a receiver hooked to the TV in the living room, and the TV in our bedroom. Both receivers pick up both cameras (we just change the channel on the receiver to switch rooms to look at), so we can check on either child from either TV.
We bought them at Sam's Club, but you can pick them up almost anywhere. The only negatives were that we had to play around with the channels to find ones that didn't interfere with our WiFi, and that the cameras are in B&W, not color.