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[Towertalk] 20M Yagi ?

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Subject: [Towertalk] 20M Yagi ?
From: (Bill Tippett)
Date: Tue, 16 Jul 2002 14:36:04 +0100
WD4K wrote:
>The qth here is on an 800' hilltop with 200-300' drop and horizon 
in the three main directions. Any suggestions before I start planning 
this next project?

        This is a very complex question best answered with:

1.  N6BV's Terrain Analysis (YT) available with recent ARRL Antenna
Handbooks (but it does not handle out of phase antennas).

2.  NEC modeling of two stacked yagi's with BIP/BOP (both in phase
and both out of phase) as well as the individual patterns.

3.  Actually, K6STI's Terrain Analysis (TA) would be the very best 
since it combines 1 and 2 above, but I'm not sure Brian is still 
selling it.  His e-mail is

        My personal guess is that you would be better off with two 
medium Yagi's (like 204BA's) at 40' and 90' with the ability to do 
either and BIP/BOP than you would with a single monster Yagi.  Given 
your effective height, you have to be careful to not get only low 
angles.  From here in NC, there are two predominant angles to Europe 
on 20 meters (1-3 degrees and 7-8 degrees) and a single antenna will 
probably not cover both well.

                                                73,  Bill  W4ZV

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