I was wondering the same this morning as far as cable TV vs. regular TV. Two things happen when running thru all the stations on the remote.

1) When moving thru the channel options with the remote, it will state "cable tv" and the channel number and we receive channels 2 thru 21.

2) When repeating going thru the stations again it will show "tv" and channel 2 thru 13 only.

This procedure alternates each time you go thru all the stations. However, neither option gives us channel 15.

I don't remember how many stations we received last year but 21 channels is plenty for us. I hope this answers your question and makes sense for everyone.