On Aug 3, 11:17*am, "JB" wrote:
"Art Unwin" wrote in message

...
On Aug 3, 5:24 am, Richard Fry wrote:

On Aug 2, 3:01 pm, Art Unwin wrote:

An end fed antenna cannot be of a fractional wavelength...

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? ?

Art, note that the vertical monopoles used by MW broadcast stations
are ALL fractional-wavelength radiators, and probably 99% of them are
end fed.
I regard a radiator with a counterpoise *as being center fed of a

given impedance to connect to regardles whether the counterpoise is
above ground or not. If a radiator is of a closed cuircuit form it may
be fed at any point in physical terms. Other peoples definitions may
vary.

This is a simplified way of looking at things. *It only works if he is to
use a horizontal loop, but doesn't address matching the antenna to the line
and in the case of "two pieces of wire", you won't have a clue where the
electrical "center" is. *One of the original posts was about a dipole where
the coax would have to follow one of the legs because it would hang down
where it shouldn't be. *That makes the feed point NOT in the center and
prone to common mode currents on the line.

It took me a *couple of posts to realize the Poster has made multiple posts
questioning different aspects of his problem and we get the whole scenario
from chasing down all his threads.

It looks to me that his real estate won't allow a balanced antenna anyway,
so he will have to deal with the issues of an unbalanced radiator anyway. *I
first thought of an Inverted L as an optimal antenna for his situation, with
remote matching for multi-band operation to keep RF out of the shack. *An
elevated horizontal loop or off center fed dipole with ladder line to a
tuner at the entrance of the shack would also be an answer to the problem..
A multi-band vertical would be a good choice for 30-10 meters. *Although
they work for 40 and 80, the pattern is not as good as a horizontal antenna
for exploiting the shorter skip.

You are correct. I should NOT have given a simplified response to a
simple question.
Your technical answer is a much better response tho I suppose I could
have made mine as technical so that he would not ask questions any
more! Good point about common mode. That should screw him up as well
as other things that you inserted with respect to how does one connect
to an antenna. We could ask him I suppose how many wires he intends to
connect to his intended antenna feed point, and if it is not two then
question how he intends to measure the impedance for matching
purposes. Yup, I could have done a better job.