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## Re: [TowerTalk] Not QUITE a tower

 To: Re: [TowerTalk] Not QUITE a tower "Paul Christensen" Tue, 13 Oct 2009 19:05:56 -0400 mailto:towertalk@contesting.com>
 ```> Any idea how close to salt water a vertical dipole array has to be > to work well? 15-20 ft to the side and 5 ft up close enough? It's an interesting subject. See "Lesson #7" in the first link below for some guidance. http://pages.prodigy.net/k2kw/learning.html http://www.k2kw.com/verticals/tests.html The other question I have not found conclusive answers to is "how much distance of saltwater is needed to establish the desired low take-off angle (TOA)?" The intermediate and long-distance conductivity and geography fields set up the TOA. But how much body of saltwater is needed to get the TOA of a vertical down to 1 or 2 degrees of elevation? For example, consider placement of a 20m vertical dipole at a QTH located at the southern edge of a saltwater bay in the U.S. (e.g., Tampa Bay). Let's say the bay's distance from the QTH to the northern edge of the bay is 5 km on a zero degree bearing. North of the bay's edge, soil extends indefinitely. From that QTH, can one expect a near zero degree TOA into deep Asia on short-path? At some point, diminishing returns sets in once the TOA is established and no further separation of saltwater makes a difference. It would be nice to have a formula that computes that final distance as a function of operating wavelength. Paul, W9AC _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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