[TowerTalk] SP7GXP antennas?

[Pete Smith N4ZR]

Frankly I'm wondering more about the physdcal durability of the 
antennas, if they weigh (as some have said) only about 2/3 as much as 
the equivalent product from JK or Opti-beam.  Thinner-walled tubing?

Anyway, that's why I asked about the RHR Maine site.

73, Pete N4ZR
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On 10/21/2021 8:43 PM, Lux, Jim wrote:
> On 10/21/21 2:20 PM, john at kk9a.com wrote:
>> I would like to put up an isotropic antenna and compare it to my Yagis.
>
> Yes, you could power your measurement system with a perpetual motion 
> machine as well.
>
>
> The Hairy Ball Theorem says that building an isotropic antenna is 
> impossible. (https://en.wikipedia.org/wiki/Hairy_ball_theorem )
>
> Hence, you build a standard gain antenna, the gain of which is 
> calculate-able from dimensions and materials.
>
> A dipole is easy, and fairly straightforward to calculate the gain 
> (including ohmic losses).  As is a "short dipole".
>
> Or, you build 3 antennas and do a three cornered hat.
>
> The antenna range literature is full of practical solutions.
>
>
> Free space gain measurements of large antennas is difficult.  I have 
> seen some herculean efforts toward that end (promulgated by people who 
> should know better).
>
>
>
>
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