Run a cable through the heating/air intake vents to the basement/other outlet, and use a cable splitter to send cable to the new line. Best if it goes from source, especially if you plan on getting a shaw gateway (easier for the tech - shorter installation set-up).
Did this in my parents house many years ago, only problem is that you're splitting the signal, and might have a weak signal if split too much, or if you use a cheap splitter (don't buy from dollar store!!!).
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