1 4 Vertical bazooka antenna for the 40m

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11//44 VVeerrttiiccaall bbaazzooookkaa aanntteennnnaa ffoorr tthhee 4400m m

Details

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I needed a omnidirectional antenna for the 40m.

Here is the schema of the antenna :

The design formulas are quite simple :

DDiim meennssiioonnss iinn ffeeeett

A = 230/F (feet) B = A * Vf C = (A - B) S = 4"

R = A * 1.05

DDiim meennssiioonnss iinn m meetteerrss

A = (230/F)*0.305 (meters) B = A * Vf

C = (A - B) S = +/- 10cm R = A * 1.05

The angle of the radials will be idealy between 35° and 45°

M Maaiinn m meennuu

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 Prev (/en/homemade/homebuilt-antennas/54-2-phased-verticals-array-40m.html) Next  (/en/homemade/homebuilt-antennas/9-bobtail-curtain-30-m.html) Vf (velocoty factor of used coax) depends of the type of cable. Don't trust to much the clasic 0.66 value : the best is to mesure the Vf with a antenna analyser, results are some surprising (espacialy when you use old coax cables).

Applied as there are, those formulas gived me results close to what theoreticaly expected.

No re-tuning was necessary.

VVLLFF

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