Range extender for wgr614 v9

Also any range extender would work the router is g class router with a max speed of 54mhz an upgrade is heading your one day to at lease a n class router you will lose some of your present wifi speed with a extender. A new router may be the the answer or a wired lan cable to the area needing to be cover and another small router acting as a access point if you need to keep the present router running. 

Here is a list of range extenders from Netgear https://www.netgear.com/support/

under home networking there are many to choice from your needs and how much you want to pay will help you make the selection you should not the best model to meet the limits of your router a lower end model should work.