I bought $5.00 of braided rope
cover at my local used chandlery
, Blue Pelican.
I ran 30' of insulated 14 ga wire up the middle and left 30' sticking out the bottom. I tied the top off on the masthead and ran it tight to a padeye that I installed near the bottom of the backstay. I ran the other 30' through the boat to the antenna tuner, staying well away from any other wires whenever possible. Works PERFECT. Total cost, about $12.00.
The length isn't important if you have a tuner. I would have run it up higher but I only had 60' of wire and this was an exercise in low cost solutions, not a spendy trip to West Marine