Check for studs at the location where you want the wire to exit.
Fishing wire from attic to basement.
Fishing a coax wire from attic to basement typically a cold air return utilizes the the walls and studs as the duct.
Do you have a chimney that runs from the basement to the attic.
It should be a straight shot to the basement.
The presumption is that the cable run will be looped from one box location down or up into a basement crawlspace or an attic then across floor joists before entering the stud cavity where the next box is located.
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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Confirm the space is free.
If there s enough clearence on the sides of the chimney you might be able to fish a cable up that way.
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Ideally use a stud finder that can tell the difference between studs pipes and other obstacles.
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.