[Elecraft] EFHW

[Guy Olinger K2AV]

On the low bands most end fed half waves are inverted L's or fairly close
and for very good reason.  That's due to the kind of support people
commonly have for an 80 meter wire that's a total of 135 feet long.

Most commonly, a pair of trees, a horizontal wire between them, and at one
end of it connected to a wire dropping vertically to the ground plus some
kind of matching network at the ground or elevated counterpoise. The only
weight is the aerial wire itself, no heavy baluns or coax in the air to rob
the "L" of height.

73, Guy K2AV

On Sun, Feb 12, 2017 at 1:29 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:

> Wes,
>
> I do not doubt what you are saying about 1/2 wave verticals, but most EFHW
> antennas are mounted as a sloper or a horizontal antenna.
>
> For portable operation, the main concern is for the ability to feed the
> antenna, and not about maximizing the far field strength.
>
> 73,
> Don W3FPR
>
> On 2/12/2017 12:34 PM, Wes Stewart wrote:
>
>> Alas, if only this was true.
>>
>> Google "radial system design and efficiency in hf verticals" and you
>> should get a cached version of Rudy Severns' paper of the same name.  In
>> it he states:
>>
>> "Alternately we can graph efficiency in terms of Ga as shown in figures
>> 3 and 4. Unfortunately this also shows how inefficient verticals are
>> even over very good ground. Very depressing! For example, with very good
>> soil (0.02/30) and 128 1/2-wave radials, the efficiency of a 1/4-wave
>> vertical is still only -2.76 dB (53%)!"
>>
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