The folded unipole is a unique antenna as it is grounded at the base and fed from the folds (drop wires).

There any many advantages to the folded unipole, providing greater bandwidth than series fed verticals, feeding the antenna from the drop wires raises the radiation resistance as compared to the loss resistance and improves the efficiency of the antenna.

This folded unipole is designed for 80 Meter, Physically short at only 30 ft with 4-20ft top loading wires,

For low band DX a vertically polarized antenna works best for me.