QAM is QAM. The "clear" part simply means it's unencrypted. If a TiVo can receive a given digital channel using a CableCard, and that channel is sent unencrypted, then by definition it can also receive the same channel without a CableCard. The issues you are describing seem related to how some tuners handle the automatic mapping of physical channel numbers (like 79.3) to virtual channel numbers (like 803). Some tuners do a better job than others at handling the optional "PSIP" data that can be included in the channel data stream to describe this mapping, but oftentimes the PSIP data is missing entirely. But that just proves our point...a manual method of mapping clear QAM physical channels into virtual channels would fix all of this.