It's called the DTVPal DVR and it is made specifically for recording over the air broadcasts.
It comes with a nice electronic program guide that is available in most cities. Our CBS affiliate (KDKA) sends out the signal here that runs that guide.
Amazon carries it as well as Kmarts on-line store.
I ordered mine from Kmart today and should have it by November 4th.
There is a nice review of the unit here...
http://www.laaudiofile.com/dish_dtvpal_dvr.html
The links for Kmart and Amazon are no longer active so I deleted them.
The replacement, identical unit is now branded as the Channel Master CM 7000PAL...
http://www.channelmasterstore.com/HD_DVR_receiver_for_antenna_p/cm-7000pal.htm