I am not sure if this is needed because both the KUSA and KTVD transmitters are shown on the signal report.
paraphrasing from wikipedia:
On 01/25/15 KUSA channel 9 began to broadcast a primary digital subchannel (9.1) on the KTVD (RF 19) transmitter as digital subchannel 9.4, "KUSA-HD."
http://www.9news.com/story/entertain...gnal/21929577/
Once TiVo updates their programming guide my recordings won't have to deal with the poor VHF-HI 2edge attic mounted antenna signal strength from 9.1.