You might wan to talk to W4EF about this sort of strategy. I think he's been
using the guys as top load scheme in his desert sojourns for top band contests.
Theres sort of a tradeoffs too, depending on the angle on the guys.
On Apr 3, 2011, at 8:32 AM, Mike Fatchett W0MU <w0mu@w0mu.com> wrote:
> I spoke to one manufacturer of these and they are working on a version
> with 3 or 4 top guys that are a combination of wire and "rope" to
> effectively create top loading. They are not sure just how much of an
> effect it would have and are going to field model it. This is an
> interesting concept. DXE has some top hats but they are for the heavy
> duty verticals which are not very travel friendly.
>
> On 3/28/2011 1:25 PM, Grant Saviers wrote:
>> Top loading the 43' will increase its radiation resistance and thereby
>> the efficiency. DX Eng has some top hats in their catalog. Some of the
>> Antenna Compendiums have articles. It's an interesting question to
>> model this for 160 - 40m. Perhaps there is a "magic" guy number and
>> length that preserves some sort of 40m match.
>>
>> My 40' vertical for 80m had 8 x 6' 0.375" Al horizontal tubes as a
>> capacity hat to resonate in the center of the 80m band.
>>
>> Grant KZ1W
>>
>>
>> On 3/25/2011 7:45 PM, Jim W7RY wrote:
>>> Great article! thanks for sharing.
>>>
>>> 73
>>> Jim W7RY
>>>
>>>
>>>
>>> --------------------------------------------------
>>> From: "Al Kozakiewicz"<akozak@hourglass.com>
>>> Sent: Thursday, March 24, 2011 10:12 AM
>>> To: "Mike Fatchett W0MU"<w0mu@w0mu.com>;<towertalk@contesting.com>
>>> Subject: Re: [TowerTalk] 43 Ft Vertical on 80/160 DX-Pedition
>>>
>>>> Have you read Phil Salas' article on base loading for this antenna on his
>>>> website? http://www.ad5x.com/images/Articles/Match160.pdf
>>>>
>>>> Al
>>>> AB2ZY
>>>> ________________________________________
>>>> From: towertalk-bounces@contesting.com [towertalk-bounces@contesting.com]
>>>> On Behalf Of Mike Fatchett W0MU [w0mu@w0mu.com]
>>>> Sent: Thursday, March 24, 2011 1:04 PM
>>>> To: towertalk@contesting.com
>>>> Subject: [TowerTalk] 43 Ft Vertical on 80/160 DX-Pedition
>>>>
>>>> I am aware of the issues with this antenna on 80/160. I was curious if
>>>> adding a wire T to the top would improve the performance on these two
>>>> bands. I am unclear what the length of the T would be or what effect
>>>> the T would have on the 30/40. I am not concerned so much with 10m-20m
>>>> as we will have other antennas for those bands.
>>>>
>>>> W0MU
>>>> _______________________________________________
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