[TowerTalk] Vertical vs Beam

[Joe Subich, W4TV]

> I agree with K4SAV - with only one minor exception... 
> considering typical urban lot sizes, for many ham I think the 
> cross-over band is 40 meters.

Again, it depends on height.  EZNEC and similar software will 
show the dipole (in its favored direction) will equal the 
vertical at around 50 feet in transmit.  In receive the dipole 
will generally be less noisy than the vertical and a rotary 
dipole will allow using the nulls off the end to reduce noise 
or QRM.  

The same comparison tends to hold for a 4-sq and 2 element 
yagi on 40 meters.  Once the Yagi (even one with loaded elements) 
gets above about 3/8 wave the low angle gain eclipses that of 
the phased array and overall gain far exceeds the verticals. 

73, 

   ... Joe, W4TV 
   



> -----Original Message-----
> From: towertalk-bounces at contesting.com 
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Richards
> Sent: Sunday, April 05, 2009 1:38 PM
> To: K4SAV
> Cc: towertalk at contesting.com
> Subject: Re: [TowerTalk] Vertical vs Beam
> 
> 
> I agree with K4SAV - with only one minor exception... 
> considering typical urban lot sizes, for many ham I think the 
> cross-over band is 40 meters.
> 
> Getting an 80 meter dipole up high enough, and long enough, 
> is hard to do on a typical city lot, whereas one can usually 
> fit in a 40 meter dipole at a reasonable height  on a typical 
> city lot.
> 
> I would love to squeeze a half-wave 80 meter dipole on my 
> city lot and I will buy a big steak dinner for the guy who 
> figures out how I can!
> 
> ================  K8JHR  ========================
> 
> 
> 
> K4SAV wrote:
> 
> > Considering the trade-offs, the rule for my station is vertical 
> > antennas
> > for 160, horizontal antennas for 40 and up.  80 meters is a 
> crossover 
> > point where either may be used.
> 
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