Quite interesting reading. Have you received peer comments?

Dan Richardson wrote:

On Thu, 2 Mar 2006 10:56:15 -0600, (Richard
Harrison) wrote:


Action of a common ground plane is different. When its balanced radials
are perpendicular to its whip, radiation from its radials zeros out
leaving the whip to do all the radiation. Ideally, a whip mounted on a
vehicle or directly on the earth behaves the same. It is the whip which
radiates.


Boy Richard, you sure missed the boat on that one!

Roy is quite correct in stating that a vehicle's body behaves as one
side of a dipole. A lopsided dipole to be sure, but one half the
antenna just the same.

A number of years ago I did a study using NEC modeling comparing VHF
mobile whips (1/4, 1/2 and 5/8-wavelength) mounted on different
vehicles. I created wire frame vehicles models for a full and mid-size
passenger cars, a small pickup truck and an SUV. The results for the
same antenna mounted top-dead-center on the different vehicles was
quite noticeable sometimes substantial.

An article I wrote on the subject can be viewed at:
http://k6mhe.com/files/mobile_vhf_ant.pdf

73,
Danny, k6MHE







email: k6mheatarrldotnet
http://www.k6mhe.com/