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## [TowerTalk] High or Low

 To: [TowerTalk] High or Low k6ll@juno.com (David O Hachadorian) Fri, 19 Oct 2001 10:36:00 +0000
 ``` On Fri, 19 Oct 2001 11:45:06 -0500 Tom Martin writes: > > If you have a three element 10 meter beam and you can put it at 80 > feet > or side mount it at anywhere from 40-60 feet, where would you put it > for > DX operation and not SS? > > Tom W8JWN Here is how I would answer that question. Go to the arrl's web site and download N6BV's latest elevation angle statistics. While you are at it, download the freeware version of his terrain analysis program. It draws nice elevation patterns, even for flat earth. Experiment with different heights to see what pattern best fits the statistical angles of arrival to suit your operating style. For example, from Arizona to Europe, the 10m arrival angles vary from 2 degrees to 14 degrees. If your antenna is at 80', it will be 4dB louder than an antenna at 50' when the arrival angle is 2 degrees. However, when the arrival angle is at 12 degrees, the 50' high antenna will be 20 dB louder than the 80' high antenna. This is why, if you have only one antenna, it should be at no higher than about 50' on 10 meters. Otherwise, you will have a null right in prime statistical territory, even for DX. You gain only 4 dB with the higher antenna for those marginal 2 degree openings, but you lose 20 dB when the band is wide open, where the higher angles are required. Maybe this is ok for the way you like to operate. By going through the analysis, you will be able to decide for yourself. If you don't want to go through all that, put your 10m antenna at 50'. Dave Hachadorian, K6LL Yuma, AZ K6LL@juno.com List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more. Also check out our self supporting towers up to 100 feet for under \$1500!! http://www.anwireless.com ----- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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