For anybody that's interested, I cycled through the 1000's tonight to show the HD channel mapping.
Any channel over 860 MHz requires a 1 GHz tuner, such as the newest Tivo models, or a Ceton, HDHomeRun, or Hauppauge PC CableCard tuner. These are the "Plus Pak" channels previously only available to Whole Home DVR subscribers.
For the most part, Cox puts two HD channels on each 6 MHz channel allocation; notably, however, ESPN, ESPN2, and TBS all share one channel (493 MHz).
And as you can see, I subscribe to the Advanced TV, the Sports and Information Pack, and HBO. However, 1206 - DIYHD - shows as "not subscribed."
Cox Omaha HD Channel Map.txt 8.2568359375k . file