A VOLTAGE balun is used at the feedpoint of a Carolina Windom. If a CURRENT balun is used the radiation from the vertically oriented feedline is greatly diminished and you have an OCF dipole. A 1:1 CURRENT balun is used at the point where the 22' section of coax connects to the rest of the feedline.
Radioworks sells the baluns you will need: A 4:1 voltage balun and a 1:1 "isolator."