[SECC] Simple Antenna for 6 Meters that Works

[K4SAV]

..."I say again a stack will beat any single antenna 90% of the 
time...period...de Rick nq4i"...

Over flat ground I will agree with you, and for MOST other locations I 
would also agree, but there are locations with sloping ground where it 
is easy to get an antenna too high.  It is these locations where a stack 
may show little or no benefit over a single antenna. 

Also remember that finding a location with sloping ground in all 
directions is hard to find.  If part of the azimuth goes uphill, then 
you are going to be worse off than a flatlander in those directions.

If you are using HFTA to model a 20 meter stack with spacing of 65 and 
90 ft, you need to correct the resulting gain HFTA gives you. This was 
the reason for my caution about HFTA with close spaced stacks.  It 
considers the antennas to be point sources. You can actually put two 
antennas at the same height in HFTA and it will show 3 dB gain.  If you 
could do this in the real world, the gain would be zero. Here are couple 
of references on stacking distances.
http://www.w8ji.com/stacking_broadside_collinear.htm
http://www.ifwtech.co.uk/g3sek/stacking/stacking2.htm

Jerry, K4SAV

Rick Dougherty wrote:

>I must weigh in on this topic...I have had considerable success with close
>spaced stacks...we had a 10m stack at 55 and 75 ft to JA and it was
>awesome...right now I am giving seroius consideration to a 4 over 4 stack
>for 20m at 65 and 90 ft...HFTA shows that this is a very awesome
>combination....I dare anyone to work more qso's in more areas with out a
>stack...the footprint on the other end is what it is all about...I say again
>a stack will beat any single antenna 90% of the time...period...de Rick nq4i
>----- Original Message -----
>From: "Tommy" <aldermant at alltel.net>
>To: <secc at contesting.com>
>Sent: Monday, June 12, 2006 9:10 PM
>Subject: Re: [SECC] Simple Antenna for 6 Meters that Works
>
>
>  
>
>>> The conclusion is that there is no stack at my location that will
>>>beat a single antenna. Your mileage will probably vary. This is a unique
>>>solution for my location, but it could be duplicated at other selected
>>>spots.
>>>
>>>A side note: HFTA does not model close spaced antenna interaction, so
>>>stacks placed closer than about 0.5 wavelength will produce optomistic
>>>results.
>>>
>>>Jerry, K4SAV
>>>
>>>      
>>>
>>Jerry,
>>
>>Quite interesting!! So I assume your located in the mountains?  Did
>>you find your best solution to just stick with a single yagi? What height?
>>
>>Also wonder what model program you use to model your various antennas
>>within, say' a 1000' circle?
>>
>>What ever antenna I have will most likely be down by this time
>>tomorrow as that 'tropical storm' is coming smack through Valdosta
>>tonight and tomorrow!
>>
>>Tom - W4BQF
>>
>>
>>
>>_______________________________________________
>>SECC mailing list
>>SECC at contesting.com
>>http://lists.contesting.com/mailman/listinfo/secc
>>
>>    
>>
>
>
>_______________________________________________
>SECC mailing list
>SECC at contesting.com
>http://lists.contesting.com/mailman/listinfo/secc
>
>  
>