RF Extender

Changed to Contour 2 which uses RF to communicate to the DVR box. My DVR box is in another room on the other side of the wall where the TV is located, connected thru the wall via a short 4' HDMI cable. The problem is that the RF does not go through the wall well, it's kind of hit or miss when you press the remote buttons. Tried new remote batteries, didn't help. Prior to Contour 2, I used an IR repeater which worked great. Does Cox make a RF repeater or extender?? Thanks