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## [TowerTalk] re: The Ultimate (Perfect) Ground?

 To: [TowerTalk] re: The Ultimate (Perfect) Ground? n4zr@contesting.com (Pete Smith) Thu, 23 Dec 1999 12:33:07 -0500
 ```At 09:16 AM 12/23/1999 -0800, Al Williams wrote: > >If all of the radiated energy directed towards ground is reflected >upwards by a "perfect salt water ground", then the skyward >power can only be doubled--3db. Why then is a salt water >location so coveted? Model a vertical with EZNEC over good-quality real ground -- maximum signal is -0.03 dBi at a 26 degree takeoff. Over very good ground, the gain is 1.26 dBi @ 21 degrees. Model the same antenna over hypothetical perfect ground, and the gain is 5.15 dBi at the horizon. Salt water is somewhere in between, of course, but signals at lower take-off angles would receive a very useful boost. Maybe you were thinking of horizontal antennas, where the benefit is much less pronounced. For example, a dipole at 1 wavelength over perfect ground has a maximum gain of 8.24 dBi, while the same dipole over real ground, ranging from medium to very good, only drops back to 7.65-7.77 dBi. 73, Pete N4ZR Don't forget to update your entry in the contest station database http://206.102.70.3/search.htm -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
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