Confirm the space is free.
Fishing wire from attic to basement.
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It should be a straight shot 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.
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.
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.
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.
Check for studs at the location where you want the wire to exit.