What does the plus sign and searching by zip in Locast do?

When you are in your DVR admin page in the sources section, I clicked on pencil for Locast. There is a + sign there, if clicked it brings up a zip code search and when I put in my zip code, it brings up channel lineups for my area. Selecting one of them brings up an add button. What would that do? (I'm afraid to try and mess it up) I tried to search around, but couldn't find anything.

It does nothing. Those settings are for regular HDHR tuners.

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