Topband: Inverted "L" Radiation Resistance vs vertical height

Joe Craig jcraig at
Wed Sep 13 11:48:20 EDT 2006

On Wed, 13 Sep 2006, k3hx at wrote:

> I'm trying to determine if it makes sense to raise the vertical portion
> of my 160 meter inverted "L" from 50 to 60 feet.  The additional 10
> feet of vertical length will require a considerable amount of effort.

Hi Tim,

Rrad goes by the square of height for 'short' verticals so you would
see roughly a 40% increase by going to 60'.  The difference in your
signal would also depend on your ground loss and this would be smaller
for a poor ground.

While I'm here, is there a source of #16 or #18 CCS wire in large
quanties?  I saw a large spool of welding wire that appeared
to be copper coated, but it seems the copper coating is to thin
to make this wire useful for radials.


More information about the Topband mailing list