[Elecraft] EFHW

[Walter Underwood]

A dipole has two elements. An end-fed half-wave is a monopole. One element.

A half-wave antenna is still a half-wave, whether it is center fed (Hertz) or end fed (Marconi).

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Feb 11, 2017, at 1:46 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:
> 
> Ray,
> 
> I think that is 'stretching' the facts a bit.
> A halfwave dipole is a halfwave dipole whether fed at the center or at an end or somewhere in between.
> The radiation pattern and efficiency is the same.
> The problem is that an end fed resonant dipole does need a little bit of a counterpoise (0.05 wavelength) in order to be able to feed it properly.
> 
> 73,
> Don W3FPR
> 
> On 2/11/2017 4:07 PM, Gmail wrote:
>> As was said previously,  all end fed antennas are monopoles with displacement current flowing from the antenna element to earth. Unlike dipoles where the displacement currents flow from element to element.
>> So without an adequate radial system to reduce the ground loss all end Feds regardless of length are only about 10% efficient.
>> There are good reasons why 45 years ago when coax became readily available we switched from endfed monopoles to dipoles.
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