[Antennas] Elevated Cushcraft R-7?

Mon May 16 10:49:54 EDT 2005

----- Original Message -----
From: "John Tait" <bravo at iol.ie>
To: "Peter Voelpel" <df3kv at aol.com>; <antennas at mailman.qth.net>
Sent: Monday, May 16, 2005 3:09 PM
Subject: Re: [Antennas] Elevated Cushcraft R-7?
> No.. It wouldn't work much better with lots of radials... It would work
> better mounted high.. Again, as Robert says.. It's a DIPOLE ...( Although
> actually, it's more like a Windom, stood on one end). There are no radials
> in the equation. The whole raison d'etre of the R5/R7 is that they have a
> very small footprint, BECAUSE they don't need radials.

even a horizontal antenna does not "need" radials or a ground screen,
but will certainly be improved by using one.
Of course the range of improvement depends on the ground conductivity
and will be highest with the poorest ground condition.
What is"much" improvement? With an antenna gain around 1dbi I would
expect 0,5 db more as being much, this 0,5db are not much with antenna gains
already at 10dbi....
concerning R7 etc. read this to the bottom:
http://w8ji.com/end-fed_vertical_j-pole_and_horizontal_zepp.htm
and this about vertical dipoles
http://www.cebik.com/gp/vdgp.html
73
Peter