antenna.barko.devby Rothammel

vhfdirectionalbeamlong-boom

Long VHF Yagi

Multi-element VHF Yagi (10+ el.)

Source: Rothammel, Vol. 2, Ch. 23.3, p. 53

Input Parameters

Frequency

MHz

Number of Elements

Element Diameter

mm

Results

Reflector

0.9729m

Driven Element

0.9297m

Director 1

0.8825m

Director 2

0.8772m

Director 3

0.8718m

Director 4

0.8665m

Director 5

0.8612m

Director 6

0.8558m

Director 7

0.8505m

Director 8

0.8452m

Director 9

—m

Director 10

—m

Director 11

—m

Director 12

—m

Director 13

—m

Director 14

—m

Director 15

—m

Director 16

—m

Director 17

—m

Director 18

—m

R → DE

0.3103m

DE → D1

0.2483m

D1 → D2

0.3724m

D2 → D3

0.4138m

D3 → D4

0.4552m

D4 → D5

0.4966m

D5 → D6

0.5379m

D6 → D7

0.5379m

D7 → D8

0.5379m

D8 → D9

—m

D9 → D10

—m

D10 → D11

—m

D11 → D12

—m

D12 → D13

—m

D13 → D14

—m

D14 → D15

—m

D15 → D16

—m

D16 → D17

—m

D17 → D18

—m

Boom Length

3.910m

Gain

8.0dBd

Front-to-Back

30dB

Feed Impedance

25Ω

Beamwidth

26°

Diagram

Radiation Pattern