[TowerTalk] Two Vertical Antennas

[Joe Giacobello]

I consistently measured 1-2 S-units difference between my 40M EDZ at 
about 45 feet in its favored direction vs a 40M vertical at 9 feet with 
four elevated radials.  Comparing the two with EZNEC showed a 10 dB 
difference, supporting the actual on-the-air data.

73, Joe

Tom Rauch wrote:

>>The 10.1MHz antenna works beautifully - I snagged YV0D
>>the first call after I found his listening frequency
>>last night in a major pileup. The 7MHz antenna is a
>>dog, which is very easily beaten in all directions and
>>distances by a dipole at 40'. (The dipole is about
>>300' from the verticals and has a higher loss
>>feedline.)
>>
>>Now why should that be?
>>    
>>
>
>I've had poor luck with verticals on 7MHz also Roger. The
>exception is when they are mounted 100 feet or higher in the
>air.
>
>First a quick comment about suggestions you elevate the
>radials. You already likely have near 100% feed efficiency.
>Removing you good ground system and replacing it with four
>elevated radials would get you back to 25-50% efficiency.
>Although four elevated radials are better than 8 buried,
>there is no possible way they or anything else would be
>better than what you have. I would not look at ground losses
>very near or in the antenna system as an issue. I would look
>at Fresnel zone losses, however!
>
>
>
>My 200 ft vertical on 160 with 100 200ft long radials equals
>or beats a 300ft high dipole broadside to the dipole. It
>absolutely kills the dipole off the ends of the dipole.
>
>My 35ft  top loaded vertical for 80 with 50-60 long radials
>equals a 100ft high dipole to Europe night after night, but
>of course a dipole at 160ft wins.
>
>On 40 meters, almost any dipole height I've tried beats a
>35ft ground mounted vertical with 50-60 long radials at any
>distance and any time as long as a contact isn't off the
>ends of the dipole.
>
>So now the question Rodger, you worked the YV0 on a band
>where almost nobody runs power, much less people use
>compared to 40, and most antennas are makeshift and big
>Yagi's are not common. What does that really tell you? Only
>that you are better than a tiny pack of snarling dog-gnats.
>
>The real question is how does the 30M vertical antenna
>compare to a 30M dipole in an A-B test? Did you ever do
>that?
>
>73 Tom
>
>
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