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Fishing wire from attic to basement.
It should be a straight shot to the basement.
If there s enough clearence on the sides of the chimney you might be able to fish a cable up that way.
Confirm the space is free.
Ideally use a stud finder that can tell the difference between studs pipes and other obstacles.
Check for studs at the location where you want the wire to exit.
From the attic lower the fish tape all the way to the basement connect your wire and then pull it back through.
For a chimney flue the wire should be 12 from the flue.
Do you have a chimney that runs from the basement to the attic.
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Fishing a coax wire from attic to basement typically a cold air return utilizes the the walls and studs as the duct.
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.