[TowerTalk] Vertical Antennas near salt-water

[Alex Malyava]

I think there are 2 different things in the same picture:
- antenna next to the salt water gets its radiation lobe closer to the
ground (the salt water). that's because the pattern is determined by
conductivity and losses of the ground many wavelength away from antenna.
- relative strength depends on how much power you are actually able to
radiate - and that depends on losses in "near" ground and radiation losses
(antenna material, number of radials etc.)

My personal, purely theoretical opinion without any first hand experience
or A/B tests:
Get the vertical as close to the salt water as possible
Get small number of real radials, not just piece of wire going down to the
water. I think that radiation resistance of 2-4-6 short copper/aluminum
radials will be much better then resistance of salt water.

On Wed, Feb 3, 2016 at 2:30 PM, Chuck Dietz <w5prchuck at gmail.com> wrote:

> I had a vertical for 160 on a small peninsula in salt water. I ran the
> radials into salt water in 4 directions and pushed aluminum tubing pieces
> into the bottom in the salt water with the end of the radials clamped to
> them. Awesome antenna on transmit. Fair on receive. Just need enough radial
> length to get to the salt water.
>
> Chuck W5PR
>
> On Wednesday, February 3, 2016, Gary K9GS <garyk9gs at wi.rr.com> wrote:
>
> > I had an interesting discussion with a friend over the weekend and wanted
> > to get some input from the TowerTalk community.
> >
> > Imagine a 1/4 wavelength wire hanging down from a tree with the bottom
> end
> > attached to a post set into the salt water.  The antenna wire would be 3
> or
> > 4 feet above the water.  What should be done with the radial/counterpoise
> > wires?  Should those wires go into the water?
> >
> > Or imagine a similar hanging wire that has the bottom end attached to the
> > top of a seawall.  Again, the bottom of the antenna would be 3-4 feet
> above
> > the water.  Should the radials run on the ground parallel to the seawall
> or
> > run into the water?
> >
> > A third situation would be a vertical antenna mounted at the end of a
> > pier.  Run the radials back toward shore along the pier or run all of the
> > radials into the water?
> >
> > Finally, if the radials are in the water does it make any difference if
> > the wire is insulated or not?
> >
> >
> > --
> > 73,
> >
> > Gary K9GS
> >
> > Greater Milwaukee DX Association: http://www.gmdxa.org
> > Society of Midwest Contesters: http://www.w9smc.com
> > CW Ops #1032   http://www.cwops.org
> >
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