Choices for recording OTA:

* The Echostar DVR
* TiVo HD (monthly fees)
* FTA receiver with ATSC tuner (generally these are pretty poor on DVR implementation)
* HTPC-based system.

I have a Sony DHG-HDD500, long out of production, and for a first (and only) generation product it really is quite good. Reliable, and it was designed much *smarter* than the SA 8300HD I use for cable.

Its main drawbacks are that it only has one tuner, storage isn't expandable (but available in 250gb and 500gb models), and the tuner doesn't hold up to current tuners (sensitivity, multipath rejection etc.).