How to delete a local OTA channel from HR20. - DirecTV

I am trying to change a secondary local channel to receive a new local in our area. I cannot get rid of one that I accidentally installed when I was trying to get another local that Dtv does not include in the guide. No matter what I put in for a secondary local that has the same RF, it refuses to overwrite the previous one. Any suggestions?

This question, "How to delete a local OTA channel from HR20.," is about DirecTV channels, programming, equipment, and sports.

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