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Fishing wire from attic to basement.
Confirm there are no crossbeams or ductwork along the path the wire will take typically straight up to the attic or straight down to the basement.
Fishing a coax wire from attic to basement typically a cold air return utilizes the the walls and studs as the duct.
Ideally use a stud finder that can tell the difference between studs pipes and other obstacles.
From the attic lower the fish tape all the way to the basement connect your wire and then pull it back through.
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Check for studs at the location where you want the wire to exit.
Do you have a chimney that runs from the basement to the attic.
Secure the wires tight using wire staples at both the bottom and top of the run to make sure that the wire doesn t bow in the middle and get close to the flue.
Then panning light gauge metal.
If there s enough clearence on the sides of the chimney you might be able to fish a cable up that way.
For a chimney flue the wire should be 12 from the flue.