From the attic lower the fish tape all the way to the basement connect your wire and then pull it back through.
Fishing wire from attic to basement.
Confirm the space is free.
Check for studs at the location where you want the wire to exit.
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.
Do you have a chimney that runs from the basement to the attic.
Https amzn to 39ohr6k close quarter power drill 3 8 right angle drill us.
If there s enough clearence on the sides of the chimney you might be able to fish a cable up that way.
Ideally use a stud finder that can tell the difference between studs pipes and other obstacles.
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.
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.
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.