Yes. Only one node must be connected to the cable modem. But the others still require AC power and must remain close enough to the next node to remain part of the mesh network. As each node is installed, the app will tell you if the location is good for the network. With three nodes, you are supposed to have enough range to cover a 6000 square foot home, which is pretty massive. So yes, in theory you could reach a large yard (with a long extension cord) or even a neighbors house