In article ,
Dave wrote:

Telamon wrote:
In article
,
Telamon wrote:

In article ,
Dave wrote:

John Smith wrote:

However, in side-by-side comparisons on 10-6-2m antennas I have built,
comparing a 5/8 against the 1/2 (construction methods/materials and
matching components identical) ... the actual difference, in the real
world, must be less than the width of a meter needle in the readings ...
or, put simply, I no longer deal with the extra length required of the
5/8 ... your mileage may vary ...

The advantage of a physical height (antenna length) between 180 and 215
degrees (see previous post regarding the magic number being around 195
degrees) is improved take-off angle and reduced skywave-groundwave
interaction, not dramatic nearfield voltage increases.
Regarding Mr. Smith's comments above my experience and others is the
opposite. 5/8 is a much better performing antenna than a 1/2 wave for
local VHF and UHF communications. Well worth the effort to build a 5/8
wave antenna over a 1/2 wave. The 5/8 had some kind of series load coil
part way up the whip where the 1/2 wave match/compensation was done at
the base so the whip was solid. Sorry I can't more specific then that as
those experiments were many years ago.

Mr. Smith is still lost in space.

Here is an example of the 5/8 wavelength antenna I recall using in the
center of the page. The one I used was permanent mount not magnetic
though. The van roof it was installed on was the ground plane.

http://www.new-tronics.com/main/html/mobile_vhf.html

When this antenna was changed for a 1/2 wave a lot of coverage was lost.
This was before cell phones so I had to start using pay phones a lot.


The one with the center coil is a collinear. It is 2 stacked verticals
with a "delay" between.

I don't think it works that way. The coil is just a way to shorten the
total whip length. I haven't looked at the design but I would be
surprised if what you posted was true.

--
Telamon
Ventura, California