[Towertalk] Antenna choices in a restricted neighborhood

[n4kg@juno.com]

On Mon, 01 Apr 2002 13:34:10 -0500 Neil J Nitzberg <njn2@adelphia.net>
writes:
> K3WA / Bill wrote:
> 
> > Antenna Police... any ideas?
> 
> One; but it requires a tuner.
> 
> Assuming your goal is DX, can you arrange to put up a horizontal 
> loop?  They can be close to the ground and still give you a lot of 
> low angle radiation.  Low noise, too

N4KG:  It is a popular MYTH that a LOW Horizontal LOOP 
	produces low angle radiation.  A 1 WL Loop close
	to the ground produces HIGH angle radiation.  The
	free space pattern for a 1WL loop has nulls in the
	plane of the loop so there is virtually NO radiation 
	off the sides which means no low angle radiation
	when mounted horizontally.  
	
	On harmonic frequencies, each side is 1 or more
	WL long and act as a complex configuration of
	long wires above ground.  The resulting patterns
	are the product of the free space patterns of the
	wires and the Ground Reflection Coefficients which
	DO depend on Height above ground and LOW 
	horizontal antennas have very little ground reflection
	at low angles.    de  Tom  N4KG

> 
> You can A/B-switch between the loop and the vertical, and select 
> whichever one is better.
> 
> -Neil / wb2cir-
> 
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