Displacement Currents

Kirchhoff's current law as boundaries.

Displacement current explains why the ends of dipole antennas have something more than zero current.

Of fields and feedpoints

Understanding how feed position along the half-wave dipole antenna affects the electric and magnetic fields around it.

The dipole antenna, how industry defines it

All dipole antennas... according to the IEEE

Is a dipole antenna defined by its behavior alone or also how one energizes it? The answer exists in IEEE and historical literature.

Slim Jim vs. Traditional J-pole Antenna

Measured gain of SlimJIM and J-Pole

Real measurements of a Slim Jim antenna and traditional j-pole antenna reveal the truth about their respective gain and pattern.

NVIS Gain of Loop and Dipole vs. Height

Observations from the Virginia QSO Party confirm simulation results concerning horizontal antennas and NVIS propagation.

Asy Hat Vertical Dipole

Three views showing a how a planed vertical need not always be the classic 1/4 wave monopole.

We re-introduce the theory and origins of Cebik’s (W4RNL) Asymmetrical Hatted Vertical Dipole (AHVD) antenna with the hope to facilitate a vertical polarization portable 20-10m aerial for portable operations.

Wideband 80m Dipole

Series Transmission Line Resonator for broadband dipole.

A 1/4 wavelength of 75 ohm coax inline with a full wavelength of 50 ohm coax is all one needs to make a simple 80m dipole become a wideband dipole antenna.

Dipole Generates Static in PL-259

Dipole Generates Static in PL-259

“Shocking” evidence our aerials collect electric charge plus an educational video on the topic of static electricity.

JOTA Antenna Need Not Be Fancy

Keep it simple for the Jamboree on the Air – Use a ladder line fed dipole.

Why don’t hams like vertical dipole antennas?

Tom, ke6ynh, asks… “Why don’t hams like vertical dipole antennas.