hi, what would work best a, 54.45 feet,with a MHz trap,inverted L, up about
25-30feet above ground,with no radials ,just the ground,ps, i live in the uk
with good soil, or a 1/2 size g5rv up 25-30 feet high
thanks Dave Browne


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In this particular case, the G5RV might be a better choice. In many other
instances other antennas will far out perform the G5RV and be easier to match
across all bands without being picky on some bands like the G5RV is. You'll
have fun in either case.

73s,

Evan

David Browne wrote:
hi, what would work best a, 54.45 feet,with a MHz trap,inverted L, up about
25-30feet above ground,with no radials ,just the ground,ps, i live in the uk
with good soil, or a 1/2 size g5rv up 25-30 feet high
thanks Dave Browne

In your situation I think you would be better off with the g5rv. With a
good tuner you should be able to run on all the HF bands.

I have found, in the past, that a inverted L doesn't work very well
without ground radials. I experimented with one that was fed at ground
level, traveled up for 25 feet, headed east to a tree branch, and then
south to another tree branch. Total length was about 96 feet. I first
tried to run with only a ground rod but couldn't get a stable match.
Then I started to add ground radials. They were just random lengths of
wire, around 25 feet long, buried about 1 or 2 inched in the ground. As
I added radials the matching became more stable and at around 5 radials
everything matched up great and the antenna worked great.

I live in the desert so my ground conditions are different than yours,
but you still may need the radials.

Martin

--
Martin E. Meserve

http://www.k7mem.150m.com

When I recently started out on HF these two antennas seemed to be obvious
canditates given the dimensions of my rear garden. I started out with an L of
similar dimensions to those quoted by the OP, and later tried a doublet (close
to half G5RV ) with an open wire feeder which ran rings around the L.
Not a fair comparison by any means outside the context of my garden and given
that the radial system for the L was 4 wires on the ground no more than 25 feet
in length.
My next step is to try a doublet of twice the length with the excess wire at
each end being guyed in various directions as necessary .
Have any of you experience of this and particularly of optimising what will
probably be an assymetric assymetric antenna?

John
M1JTA