Topband: Electrical height of short shunt fed tower?

[Jon Zaimes AA1K]

Anecdotal: In the 1980s, I had a 100-foot Rohn 25 shunt-fed tower with 
200 radials. On top was a 204BA (4-el Hy Gain 20m yagi). The mast 
extended 12 feet above that. Later when I added a 4-el 15-meter Wilson 
yagi (17-foot boom) at 112 feet, there was no change in the shunt tuning 
needed or in the SWR. Perhaps if the higher antenna had been larger than 
the lower there would have been a difference.

73/Jon AA1K

> On Mon, Nov 9, 2009 at 2:10 PM, Mike & Coreen Smith <ve9aa at nbnet.nb.ca>wrote:
>
>   
>> Hi Gang,
>>
>> Some folks mentioned that the top yagi is not "seen" on my short tower if I
>> should shunt feed it.
>> Is there any proof of that? Papers? EZNEC? Anecdotal evidence etc? (like
>> you
>