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vhfuhfverticalomnidirectional

J-Pole Antenna

J-shaped vertical antenna for VHF/UHF

Source: Rothammel, Vol. 2, Ch. 25.1.2, p. 105
Input Parameters
MHz
Results
Total Height (3λ/4)
1.4741m
Radiator (λ/2)
0.9828m
Matching Stub (λ/4)
0.4914m
Feed Tap from Bottom
25mm
Stub Gap
21mm
Gain
2.2dBi
Diagram
50 Ωgap 21 mm1.47 m0.49 mλ/2λ/4
Radiation Pattern
-3 dB-10 dB-20 dB0 dB0°90°180°270°Max: 0.0 dBi