Question 1

What is the dipole antenna length formula?

Accepted Answer

The standard half-wave dipole formula is Length (feet) = 468 / frequency (MHz). For metric: Length (meters) = 143 / frequency (MHz). The constant accounts for end effects and conductor diameter. With velocity factor (v) for insulated elements: Length = (468 * v) / f.

Question 2

What is velocity factor and when to use it?

Accepted Answer

Velocity factor (VF) accounts for slower wave propagation on insulated or covered conductors. For bare copper wire VF = 1.0; for insulated wire (PVC) VF ≈ 0.95; for twin-lead VF ≈ 0.82. Using VF shortens the physical length required for resonance.

Question 3

How to use the bulk dipole length calculator?

Accepted Answer

For single calculation: Enter frequency (MHz), select units, adjust velocity factor if needed. For bulk mode: Upload TXT/CSV with format: Frequency_MHz,Units(feet/meters/inches),VelocityFactor per line. Click Process Bulk. Results include dipole length, wavelength, quarter-wave length, and half-wave in selected units.

Question 4

What is a good half-wave dipole length for 100 MHz?

Accepted Answer

For 100 MHz, half-wave dipole length = 468/100 = 4.68 feet (56.16 inches) or approximately 1.43 meters. The quarter-wave element length would be half of that: 2.34 feet.

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