I would like to extend my deco network. I have two units, one is the main unit and the other is connected wirelessly as an extender. Do I have to purchase additional units to extend the same network, or is there a less-expensive extender that can extend the existing network. I inadvertently purcahsed a one-mesh extender but it just creates a different named network and is apparently not compatible with the deco quad band. 

Please advise. 

Carlo