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Don't mix cable and OTA TV
Even if the only subscribed service on the coax is internet, You have to assume the cable company is still sending signals on all the frequencies that will conflict with OTA transmissions.
FWIW: The newer cable system topology sends every thing as data, modulated on multiple carrier frequencies ranging from a few MHz to over 1000 MHz. By digitizing all of their 'products' they can apply encryption to control which customer can receive which program or service. They no longer need to filter out premium frequency ranges as was done back in the analog days.
Please, keep the coax that carries cable company 'service' isolated from your OTA TV coax system.
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