Voom boxes do not offer OTA Schedule information. If it's any comfort, they will work with SA tivo boxes though. Granted, the tivo makes it SD, but it looks great when compared to it's own internal OTA tuner. It's also about the best way to record stuff off of the Voom box. No firewire ports for D-VHS/Computer hookups!
Also, what's neat with a SA Tivo is you can intergrade the DTV channels with the non DTV channels. I live in Cleveland, PBS and WB do not offer Digial transmissions. My wife learns one "system" and doesn't have flip inputs on the TV around just to channel surf. She has one remote that controls the TV, Tivo (analog) channels, and Voom (digital) channels.