Hi I have a balanced tuner and plan to build a new vertical for use on 40,20,17,15 and 10. I am limited to about 5 meters in height. Option 1) is to use a 5 meter scaffold pole with top loading for use on forty meters. Then add radials, Bury coax to fence then add 1;1 balun(if required) and then ladder line back to my atu. Other option is to use a 5 meter pole and make a vertical dipole fed with ladder line. My understanding is that with a good Tuner a vertical dipole can be efficient up to 1/8th of a wavelength. (DJOIP website talks of a 12 meter pole being used for a vertical doublet on 80meters) In the real world with no salt water included which vertical mentioned here may be more efficient? Is there an advantage to ocf or balanced vertical dipoles?