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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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15y ago

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Q: What is Formula for 40 meter vertical antenna?
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