On 3/8/2012 11:09 AM, dave wrote:
On Thu, 08 Mar 2012 08:51:20 -0600, NM5K wrote:

Also, ground mounted verticals will still need radials if the antenna is
to live up to it's expectations. And there is nothing to stop one from
using one elevated, if one uses resonant radials for each band to be
used.

My GAP Titan DX requires no radials; it is a center fed, asymmetric
vertical dipole.


Well, ground mounted monopoles in his case..
Being a "complete" antenna, it's true that the center fed vertical does
not require radials for proper operation, but you would still likely
show lower ground losses if it were over radials.
For instance, broadcast stations that use 1/2 wave radiators still
use a set of radials under the antenna. Usually 1/2 wave radials, when
used with a 1/2 wave radiator.
You will still see some ground loss with the ground mounted 1/2 waves
over poor ground, but being as the max current point is 1/4 up from the
ground, it's not near as severe as the ground mounted 1/4 wave where
maximum current is at the base.