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Keep in mind that the HD component of the FM signal is -20 dBc to the main signal (unless the station applied for and received permission to increase power to the -12 dBc) level. That means for HD Radio, you need to maintain stronger signals at the receiver as opposed to standard FM radio.
Two of your named stations are moderately strong to your south, the other is to the NNE and is from 10-15 dB weaker. I have a similar situation at my home. I use our three-element FM antenna aimed at the weak signal and receive the stronger stations off the rear of the antenna. It has worked very well for my system.
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