[BC] FM antenna radiation patterns

[Craig Bowman]

And with a Ring Stub you can do that.  Dual polarized antenna's have 
fallen out of favor for a reason.  Circular polarization substantially 
reduces multipath.  All that V-pol does nothing for you once it hits an 
object and changes polarity. It has always been my opinion that if you 
know where your signal will go that it is incumbent upon you (as a 
public service) to place that signal over the highest population, city 
of license notwithstanding.

Yes, many stations use the pattern distortions to their favor but there 
is much more to it than simple V-pol gain.

Craig Bowman


DANA PUOPOLO wrote:

>Why?
>How about because you WANT a distorted pattern because you want to concentrate
>your signal where the population is.
>
>I consulted a Massachusetts FM station 15 years ago. Their TX was located
>about 40 miles west of Boston on a hill known for great FM transmission. They
>had a rototiller antenna pole mounted, and a fly around showed it's pattern as
>an almost perfect circle, both H and V....
>
>Which was exactly what they DIDN'T WANT!  
>
>Why? Because 10 miles west of them was the Quabbin reservoir and nothing/no
>one!  All the people lived EAST of the transmitter, in Boston and its
>suburbs.
>
>We used a ring stub antenna and came up with a pattern that put 35% nore
>vertical field east then the rototiller. The difference was dramatic...the
>station can now be heard in places where it didn't exist before and its signal
>is MUCH better where the people live.
>
>-D
>
> 
>
>------ Original Message ------
>Received: Fri, 20 Jan 2006 06:40:20 PM PST
>From: "Steve Michaels N4AY" <steve at stevemichaels.net>
>To: "'Broadcast Radio Mailing List'" <broadcast at radiolists.net>
>Subject: [BC] FM antenna radiation patterns
>
>I am curious-after looking at Richard Fry's paper, it would appear that the
>ring-stub radiator has a drastically different pattern from the rest.
>Without using names (they will be obvious from his presentation) why would
>anybody want that design?  I don't believe everything I see or read, but
>this seems kinda wacky..  
>
> 
>
>The website is rfry.org  presentation link on the bottom of the page
>pertaining to zero sidelobe antennas.
>
> 
>
>And I do apologize for what may have been an issue addressed before.
>
> 
>
>TNX,
>
>Steve
>
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