Topband: An oddball question about a BOG.

[Greg - ZL3IX]

My own experience is that a fence does not degrade the Bev pattern too 
much as long as the Bev is sufficiently high above the fence wire. I 
mount my wires about 3 m above the fence.

I have never modelled an inductively-loaded Beverage, but my intuition 
is that it will not perform any better than an unloaded wire of the same 
physical length. The pattern of the Bev is generated by virtue of the 
fact that it is excited by different parts of the wave front, the 
relative phases of which depend on the direction from which the front 
arrives. If the wire itself is too short this desirable decorrelation is 
not achieved.

At HF we can inductively load a yagi to make its elements physically 
shorter at resonance, but we still need the same spacing between the 
elements if we want to duplicate the radiation pattern of the unloaded 
yagi. I suspect that the Beverage would behave in a similar fashion.


73, Greg, ZL3IX



On 2019-08-25 05:52 a.m., Mike Waters wrote:
> As long as the fence is pointed in the right direction. :-)
>
> www.w0btu.com/Beverage_antennas.html#Misc_Beverage_antenna_notes
>
> On this page, there are some links to ZL3IX (?) experiences with his
> Beverages mounted at different heights above metal fences.
>
> 73, Mike
> www.w0btu.com
>
>