calculated for 3-element Yagi-Uda antenna.
Printed in YAGI-UDA ANTENNA, in 1954.

Dimensions.
Radii (ρ) of the conductors (ρ=λ/200) are taken into account.
Lengths of the fed element (2 l₁) and the reflector (2 l₂) are bothλ/2
Spacing between fed element and the reflector d₂ is λ/4.
Length (2l₃) of the director (vertical axis) and the spacing d₃ from the fed element (horizontal axis) are varied.