[TowerTalk] tower height repost

[K8RI]

On 10/14/2012 6:16 PM, Brian Alsop wrote:
> I don't know if HTTA has any arrival angle data for 6M.  It's
> predecessor YTAD did not.
>
> Without arrival angle data how would you know some antenna height change
> is good, bad or indifferent.
>
> I seem to recall Es prop (at least for 1 hop) is relatively high angle.
> If this is what one is after, then lowering rather than raising the
> antenna is a better idea.   Many 6M ops find 20-25' works pretty well.

I doubt over the long haul (time not distance) you would see very little 
difference between 40 and 50 feet, depending on your surrounding terrain.

I've found 115 feet for my 7L C3i to be outstanding for Es, F, and, Au, 
BUT Es can be most any thing. Typically Es occurs anywhere between 55 
and 100 miles of altitude (IE lower than F). The clouds may be close or 
right on the radio horizon. It may be single or multi hop. So for 
6-meters most of us go for what ever is handy because Es can be anything 
from very low angle to very high angle. Now if you have the property and 
checkbook, multi stacks are popular because you can select the best 
angle. One ham near here had 3 or 4 stacked pair on which he could 
select any combination from a single pair to all.

I have neither the real estate or checkbook for an installation like that.

BTW I went for 115 feet as it was the only open spot on the tower.

73

Roger (K8RI)


>
> 73 de Brian/K3KO
>
>
> On 10/14/2012 21:07, Bob K6UJ wrote:
>> I think it will depend on your surrounding terrain.  Are you on a hill
>> with a clear shot in all directions ?
>> I have hills NW of me and going from 40 to 50 feet makes a big
>> difference.  I ran the HTTA program on the
>> CD in the latest ARRL antenna handbook and it was very enlightening to
>> see how different heights affected
>> my antenna pattern.  I would recommend running HFTA and see what it
>> tells you for your site.  That is the
>> intended purpose of the program and it works very well.
>>
>> 73,
>> Bob
>> K6UJ
>>
>>
>>
>> On Oct 14, 2012, at 11:09 AM, mikflathead at aol.com wrote:
>>
>>>
>>>
>>> I am getting ready to put up a Universal Tower 50 foot aluminum
>>> tower. I live at
>>> a very high elevation. It will have a 7 element KLM 6 meter beam and
>>> a 16LBX for
>>> 2 meters. Will I see any difference between 40 foot and 50 foot
>>> height? It is
>>> difficult to lower the tower with the trees I have in the yard.
>>> Thanks Mike
>>> _______________________________________________
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