Want to learn more? Here is some more reading on OCF dipoles:
* DJ0IP OCF dipole
* K8JHR OCF dipole (pdf)
* W8JI on OCF dipoles
* VK2DQ OCF dipole (pdf)
Note that you will sometimes see reference to the 'Windom'. From a distance it looks the same as an OCF dipole. However it uses only a single wire feedline. That was suitable for the transmitters of the time where the wire could be tapped onto the output coil. Windoms now are rarely if ever used and what some people call a windom is likely to be an OCF dipole.
PS: Want to read more about antennas and other amateur radio topics? These books could be of interest. Available in both electronic and paperback.