kind of a broad question. this device, when it is supported will allow for HD from acable box or a sat provider, which will allow for "premium" channels. For the time being , many are using the HDhomerun which is a dual QAM tuner. It will receive over the air "local" HD, or QAM which is how several cable compaies are relaying the local HD content unencrypted over the wire.
Shaun
Shaun