[BC] High Gain vs Low Gain Antennas

[Craig Bowman]

Richard Fry is absolutely correct when he states (and let me paraphrase) 
natural (tower re-radiation) null fill makes predictions of nulls in the 
vertical plane impossible and most of the time they do not exist.  There 
might be some minima's but nothing approaching zero.  The theory behind 
the predictions is based on an antenna fed with imaginary transmission 
line (non conductive at least) suspended in mid air.  It is not 
reality.  Think about it, how can the theoretical values be close to 
reality?  With a vertical parasite (the transmission line) immediately 
behind the antenna then immediately behind that are a variety of 
parasites consisting of horizontal, vertical, and diagonal.  The 
interaction / re-radiation is substantial.  You truly have to see it to 
believe it.

Craig Bowman
Bowman Engineering
Durand, MI

WBRadiolists at aol.com wrote:
> In a message dated 02/22/2009 12:46:04 AM Eastern Standard Time, 
> glen.kippel at gmail.com writes:
>
>   
>> I would have to ask:  are there any people in that area 1.5-2 miles from the
>>  transmitter?  If not, I wouldn't worry about it. 
>>     
>
> Well, the Merritt Parkway *is* a pretty heavily-travelled road! :)
>
> At least this helps to explain why I heard picket-fencing, when I thought 
> that the signal should have been "off-the-scale".
>
> Willie...
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