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To build a 1/4 wave 40m vertical with elevated radials using insulated wire, the formula is:
234 / operating frequency x 0.95804
The number 0.95804 is a constant used when insulated wire is used.
Example: 234 / 7.2 = 32.5 feet x .95804 = 31.14 feet or (31 feet 1.7 inches)
This antenna is best when elevated 8 to 10 feet above ground. Radials are also elevated. A minimum of 3 radials spaced 120 degrees apart can be used. More is always better. This type of configuration has a very nice low takeoff angle some wheres between 10 - 20 degrees.
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Continue Learning about Other Math
How much is 1 meter and 40 centImeters?
1.4 m 1 meter = 100 centimeters 1 centimeter = 0.01 meter
One cent is how much square meter?
40
What fraction of 1 m is 40 cm?
40/100 or 2/5
What fraction of meter is 40 centimeters?
40 cm / 1 m = 40 cm/100 cm = 40/100 = 0.4
What is 40 x 40 Feet in square meters?
Multiply by (0.3048x0.3048) 1 foot = 0.3048 meter
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