[BC] High Gain vs Low Gain Antennas

[Richard Fry]

>...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.
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Below is a link comparing NEC-2 elevation patterns for a 4-bay, 1-wave 
spaced FM antenna face-mounted on a 24" face triangular tower section to the 
theoretical elevation pattern as published by an antenna manufacturer.

The NEC patterns shown in the upper left and right corners of this slide 
were calculated for a slice across the elevation pattern at the zero-180 
degree azimuth line.  They would be different for slices in other azimuth 
directions.

The difference in the angles and amplitudes of the lobes and nulls is easy 
to see.

http://i62.photobucket.com/albums/h85/rfry-100/ElepatCompare.gif

RF