For
both Single-wire and Bi-directional Beverages - Compensating for ground
characteristics

U N D E R C O N S T R U C T I O N

Z = Antenna impedance in ohms

h = height above ground

d = diameter of wire (in same units as height)

h = height above ground

d = diameter of wire (in same units as height)

Z = antenna impedance in ohms

h = height above ground

d = diameter of wires

S = Spacing between wires, center-to-center

(h, d, and S must be in same units)

h = height above ground

d = diameter of wires

S = Spacing between wires, center-to-center

(h, d, and S must be in same units)

Z = transmission line impedance in ohms

S = spacing of the two wires, center-to-center

d = diameter of wires (in same units as spacing)

S = spacing of the two wires, center-to-center

d = diameter of wires (in same units as spacing)

- All dimensions in all three equations must be in the same units (such as inches or meters)
- The
first two equations are for a Beverage antenna over "perfect" ground.

The type of ground under the antenna, as well as the ground rod/radial resistance, can affect the antenna and termination impedance values to some extent. More on this here soon. - Surge Impedance (Wikipedia)
- Beverage antenna
(Wikipedia)

Back to Calculating impedances is easy

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