Connecting DVD/VCR combo recorder to record Directv to dvd

We just moved and got hooked up with new receivers. Since we got a free HD DVR, we figured it was time to upgrade and get an HDTV. Now we have a 1080p 47" LED HDTV. Before with our standard tv, we had a standard Hughes Tivo/dvr and it was connected to our dvd/vcr combo recorder and could record Directv to dvd via an RF modulator.

I can't figure out how to reconnect it all with the new equipment because before with the standard dvr, we had a coax and s-video connected to the rf modulator so we could see directv and our dvd recorder menus on channel 3. Our new hd dvr doesn't have a coax connection, so how do I make it all work?!

Thank you!

Brian