How far away its the tv? You can use coax through an rf modulator. Use hdmi to the tv your dvr is on, and composite cables form your dvr to the modulator, then from the modulator you would use coax to the other tv. It would be a mirror image
This can b a tuff job if I've never done this. The safest and easiest way is to call and have a tech sent out. That way u know it's done right. Because if we do the work it under r warrenty. 1-800-531-5000. Thank u. If u want to do this let me know and I will assit u.
are you planning on using a 2nd receiver on the 2nd tv? if you are mirroring from the hd-dvr whatever is being watched on that tv is what you have to watch on the 2nd tv unless you have another receiver.