2 tuners - 2signals question??

In MCE 2005 I understand a seperate signal is required for 2 tuners... and that it must be from the same source because of the Guide. I have read examples as to 2 STB's or 2 OTA's. That an OTA and STB would not work because of the guide. But what about an STB and an Analog from the wall if the channels were the same. i.e, STB channel 4 = anog 4 etc -- and then on the high end nothing on the analog and the STB handles the rest.


Anyone try this yet? I still have 1 tuner so I cant test it myself