Regardless of how many or what type of cables you run from the cable box to any tv. The channel on the box is the only channel you will get. Since your TV's are HD, the only cable you need running from the box to either of your TV's is the HDMI cable. The coax and RCA will just give you a lower resolution picture of the same channel.
If you want to be able to watch a different channel, you'll need either another cable box or an antenna.
To my knowledge all broadcast TV has switched over to a digital signal as of a couple of years ago. The antenna, or one similar, that I linked above should pick up all of your local channels. That would allow you to watch a different channel.
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Methods, application and intensity of application vary by the individual. All legal wavers must be signed before 'treatment' begins. Self 'Medicating' is not recommend. However, if necessary, it is best to have an 'assistant' or 'soft landing zone' nearby. Any and all legal issues resulting from improperly applied techniques should be forwarded to: Dewy, Cheatum & Howe, Intercourse, PA 17534. Attn: Anonymous.
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