Topband: NE7D loaded tower

[Tom W8JI]

> "More then once I burned a loading  wire.... over the years I had that 
> configuration."  The solution for this is a wire cage as it does most of 
> the radiating rather than the tower itself.  It is also easier to feed 
> with a simple network especially if you find the sweet point tap.
>
>


The problem is the voltage at the top of the tower. A cage does not 
guarantee the voltage would be zero, because the Yagi would be up outside 
the cage. In a similar fashion, an Inverted L would not guarantee no 
damaging voltages.

Floating element antennas are often some sort of issue. I would never build 
one floating that way, if for no other reason than insulator failures from 
external common mode.

73 Tom