Of fields and feedpoints

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

SlimJIM and Antenna Gainflation

E-plane gain plots of J antenna variations

Understanding why SlimJIM antenna aficionados hype the gain in their marketing and discussions.

Ground effect

40m monopole over various ground conditions

Ground conductivity, permittivity and the effects on vertical monopoles.

Radials and their far field effects

H-plane gain of monopole with 1, 2 and 3 radials

Radials are peculiar things worthy of some explanation.

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.

Mast Mountable J-Pole Antenna

Overview highlighting novel features of mast mountable j-pole antenna.

The J-Pole antenna’s long and storied design history is due for one more chapter to mitigate the longstanding mast current and reliability issues.

Have your J-Pole and ground it too

1.06 GHz Test J-Pole Antenna

Tame the predictable mast currents found in any j-pole antenna grounding conductive mast using a simple stub. Shown is empirical evidence why this is a problem and a very simple solution all future grounded j-pole antennas should incorporate.

The Coaxial Dipole

The Coaxial Dipole

G4CQM provides details on a Yagi-Uda coaxial dipole driver approach for designers lusting after a 50 ohm self-balancing feed.

HF AHVD on 6m – Practical?

Tall 6m AHVD making local contacts.

Will the KX4O version of the 20-10m Asymmetrical Hatted Vertical Dipole work on 6m? Yes, sort of.