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How do you use your cable TV signal now? Are you subscribed to digital cable or are you using analog cable?
Broadcast TV channels 2-69 use frequencies from 54 MHz to 806 MHz. The major US broadcasters are no longer using channels 52-69, so if you only count channels 2-51, that leaves you with frequencies from 54 MHz to 698 MHz.
Analog cable TV channels 2-125 use frequencies from 54 MHz to 804 MHz.
Digital cable TV channels 2-158 use frequencies from 54 MHz to 1002 MHz.
If you use a cable modem, then the lower frequencies below 54 MHz also need to be passed to the cable system (that's where the up-stream traffic goes).
I don't think there's any good way for both systems to share one set of coax without causing major problems. If you need both sets of signals, then you're really better off running a parallel set of coax.
Direct Broadcast Satellite (DBS) systems, on the other hand, are different because they only use higher frequencies (between 1 GHz and 2 GHz) which do not conflict with OTA frequencies. It should be possible for satellite and OTA signal to share one set of coax if they are combined through the appropriate diplexer.
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