DX Engineering supports AHVD antenna
DX Engineering supports the build of the Asymmetrical Hatted Vertical Dipole (AHVD) antenna with standard and two custom parts.
Antennas
Simulations and testing are shown in these articles about ham radio, and a few other, antennas.
When antenna tilt matters
We test a popular VHF/UHF dual band antenna at various angles to reveal antenna tilt on a vehicle matters only in certain circumstances.
Diamond NR770HBNMO vs. Comet M-24M
The Diamond Antenna NR770HBNMO paired with their K515S insulated luggage rack mount provides measurable and observable upgrade for my 2015 Subaru Forester 2m/440 mobile.
Radials mitigate feedline and mast currents, tests reveal
Antenna patterns from a Diamond X50NA reveal how radials of proper size mitigate current running down the feedline and mounting structure.
J antenna and variations thereof
There are many ways to morph the basic J antenna into useful forms.
J Antenna Design Patent Grant
USD798847S1 showcases one more incremental step towards a J antenna that works with masts and feedlines.
Mast Mountable Antenna Patent Application
The “mast mountable antenna” patent application is now available to review and critique.
N9TAX 2m Slim Jim Antenna Review
Erroneous specs aside, the N9TAX VHF SlimJim antenna is an exemplary dipole.
The limits of aluminum antenna tubing
Aluminum comes in varying grades and the Diamond Antenna CP22E demonstrates why not all aluminum is created equal.
Runt radials
Antennas shipping with ineffective antenna decoupling are on the rise as manufacturers daringly advocate 1/12 wave radials work.
Diamond CP22E Antenna Review
Despite some antenna gain hype, the Diamond Antenna CP22E 2m base station antenna is a remarkable design achieving 5 dBi directivity in a slim low-profile design.
Decibel hell & the reign of antenna gain pain
A short history of antenna gain terminology and some guidance to muddle your way through some of the nefarious alternative facts you may encounter.
Displacement Currents
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.
Antenna pattern plots: Good intentions vs. good data
In the 21st century should we believe antenna graphical gain data based on hope and hearsay? J-pole antenna gain drawings are a common bad example.
SlimJIM and Antenna Gainflation
Understanding why SlimJIM antenna aficionados hype the gain in their marketing and discussions.
The dipole antenna, how industry defines it
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
Real measurements of a Slim Jim antenna and traditional j-pole antenna reveal the truth about their respective gain and pattern.
Small Loop HF Antenna
With components from a variety of vendors, custom machining and a bit of trial and error, another variant of a small loop HF antenna is born.
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
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.