[Lowfer] Active Whips and Rubber Sheets

[Tom Rauch]

> Many of you are no doubt familiar with the "rubber sheet" theory that
> states to avoid electrostatic fields and obtain maximum performance
> from any active whip antenna, you need to place it at the highest
> possible point in the area.

I'm not familiar with that theory, but would like to be. 
 
> 1. In your experience, am I likely to achieve much more performance if
> I place the whip on top of the 40 foot mast?

This is identical to my work with small vertical probes for 160 
meters. 

How do you divorce or choke the mast and feedline from the active 
whip? If you do not effectively electrically isolate the two, which is a 
very difficult task, all you do is create a larger (longer) antenna.

How is the active whip isolated from the feedcable and the 
mounting, and what does it use for a counterpoise?
73, Tom W8JI
W8JI@contesting.com