[TowerTalk] Omnidirectional Antenna Installations (Specifically) and Lightning

[Terry Conboy]

At 10:41 AM 2006-07-03, ersmar at comcast.net wrote:
>      My recommendation would be to use four DC-grounded folded 
> vertical dipoles spaced around the perimeter of the water tank, and 
> fed with the appropriate phasing harness.  Check out Cushcraft's 
> commercial antennas such as 4504P at http://www.cushcraft.com/ 
> (click on land mobile/paging and follow through to their VHF and 
> UHF arrays.)  You might be able to get some technical assistance 
> from their engineers on phasing harness design for your specific app.

As Ben indicated, multiple antennas with any significant spacing will 
generate a multi-lobed pattern with lots of nulls.  This will be the 
case with or without reflections from the water tank.

Even though the individual Cushcraft units should perform 
satisfactorily, when phased together, the pattern will be a mess.

73, Terry N6RY