Charlie wrote:
Hi Richard thx for the reply but in thinking it over it would seem an

unlikely possibility that I could accurately model the 5-BTV with
it's
traps. Did I miss something there?

Hi Charlie, A 5-BTV with 72 radials will have about the same take off
angle as a full size vertical with 72 radials on a given band. This is
assuming the 5-BTV is operated as a 1/4 wave, current fed vertical on
all bands. If it is used as something else, say a 1/2 wave voltage fed
vertical on a given band, then the TOA should be about the same as a
full size 1/2 wave vertical.
As you can tell by other posts, actually measuring the TOA will be
difficult. If you could model full size versions of the 5-BTV on the
bands of interest on a program such as Eznec, you could find out your
TOA. As Reg asked, when you do find it out, what are you gonna do
then?
Gary N4AST