[Antennaware] Terminated Vertical

[Andy Ikin]

Good evening Guys,

I would like to thank both Terry and Gary for their off-line and on-line 
response to my question posted below.

> Good morning Guys,
>
>
> It is possible to achieve the same reception pattern of a ground mounted
> vertical using a 22ft aluminium pole with 2 sloping wires affixed to the
> top of the pole? Each wire comes out say 15ft from the pole ( 5ft above
> ground ), then bends back towards the base of the  pole and is connected
> to a ground rod via a 1k resistor i.e. the antenna looks like a single
> K9AY loop with 2 termination resistors. The insulated 22ft aluminium pole
> and the ground would be connected to a high Z input bipolar buffer
> amplifier with common mode feeder isolation choke.
>
> This configuration ( if it works) would provide lower noise than a FET
> active vertical with higher immunity to static damage! Also the amplifier
> would see a resistance loaded antenna rather than a small capactance of a
> whip antenna.
>
> 73
>
> Andy  G8LUG


Terry was very kind enough to model the above idea and with  a 500 Ohm shunt 
on the amplifier input. Both models provided  a typical vertical Elv. and 
Azi. pattern. However, dual termination provides a much lower capacitve 
reactance compared to the 500 Ohm shunt from 0.5 to 2MHz. Thus I believe, 
the dual termination will be ideal for driving a tranformerless unity gain 
bipolar buffer amplifier. This hopefully should provide some additional gain 
and with a well defined phase charateristic for use in wideband endfire 
arrays?!!

73

Andy