Is your front TV "new" or "old" technology? Meaning does it get over-the-air (OTA) channels without a converter?
While this may not apply to your scenario, my front TV is a fairly new Philips LED HD TV, that will receive OTA channels without a converter.
We have to do an "auto-scan" of channels with the "antenna" being connected by the "Box-Of-Many-Buttons" (BOMB) to get the OTA channels recognized by the TV. That is normal and the TV will remember those channels as long as I don't move the coach.
There is a hitch, however, when we want to switch to satellite. We have to connect the satellite box via the BOMB and do another auto-scan so that the TV will recognize the channel that the satellite box is sending the signal to the TV on - in our case, 3. When we want to switch back to OTA channels we have to do another auto-scan with the antenna connected via the BOMB.
The bedroom TV is old school and has a Digital Stream brand digital-to-analog converter. When it does an auto-scan it finds and remembers the OTA channels. It allows us to manually select analog channel 3 so that we can connect to the satellite box via the BOMB while not forgetting the previously scanned OTA channels.
I called Philips and the CSR in India was of no help. The setup feature does have the option of selectively adding channels but it will not accept an analog channel using that process.
I'm assuming that your TV sees your cable box the same way my TV sees our satellite box. I've never tried cable TV.
Good luck with yours. Keep us posted.
Dave & Cathy, 2002 Country Coach Affinity, 42', #6103, CAT C12, 2003 Cherokee Overland