Trees, particularly in the warmer weather should show up as a *lossy*
rise in the the landscape/terrain close in (near field). How much of a
rise and how lossy is a real wild card but it could, in some cases
have a substantial effect and very little in others. That variability
would make it extremely difficult to model accurately.
Although I hear it said often, I see no real reason for a quad treating
the trees much differently than a Yagi.
Roger (K8RI)
David Gilbert wrote:
> How, pray tell, does using a quad versus a yagi have any effect on the
> attenuation of the signal after it leaves the antenna?
>
> Dave AB7E
>
>
> Edward Sylvester wrote:
>
>> My opinion is that, at treetop level, you will be ok with a Steppir, as the
>> take off angles will be high enough to miss the trees....But if you are well
>> below (50' tower below 70' trees), you will signal will suffer some
>> attenuation. A quad won't suffer as much due to its closed circuit design.
>>
>> I have a Steppir, too but it's in the clear. Best of luck.
>>
>> Ed NI6S
>>
>> Joe <joe@wd0m.com> wrote:
>> My 4L SteppIR is at treetop level - on a 55 foot tower. I've worked 307
>> entities in about 4 years - SWR is flat across the bands, including 40,
>> and 30M is about 1.5 or so to 1. A SteppIR will work wonders, and the
>> tower height should of little impact.
>>
>> Good luck!
>>
>>
>>
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