Sounds to me like its a not so simple case of more power line noise coupled
into the antenna at it increased height, which at its new height is also
closer to the height of the power line. But the comments about the large
difference in noise observed and also the contradiction to the square law
effect are interesting.

Maybe the question we should be pondering is NOT what the changes in the
antenna pattern are, but what the antenna pattern of the *power line* at the
observed freq is. These things are by nature antennas as well which also
exhibit directivity and gain (I'm cringing at the thought of future BPL
"dx"), but would probably be impossible to model since there are too many
unknowns.

So my 2 cent theory is that the original antenna location lies in a power
line noise pattern null (or no low angle) and at the new height it's now in
a lobe.

John



"Richard Clark" wrote in message
...
On Sun, 28 Nov 2004 06:47:45 -0600, Warren Bowery
wrote:
Reg - any increase in signals certainly did not increase enough to
overcome
the noise. Like I mentioned, the original configuration I is very quiet.
In fact, the noise level went from not registering on the meter at all at
the lower height to an S9+ when I raised the antenna.

Hi Warren,

Then it appears you upset the balance of the antenna (hard to believe
it was balanced before) such that common mode noise is finding its way
in.

It seems entirely unlikely that you achieved any more gain, nor more
highly resolved angular discrimination to now be focused on a source
of noise that has "always" been there.

The way I read your statements, it's as if you raised your antenna to
the equal horizon of a noise your antenna in its former position just
couldn't see. At HF and at those heights, this just isn't in the
cards. Signal intensity follows square law and for your noise to rise
from nothing to S-9 does not correspond to any dimensional change (or
if it does, there's your clue, but you are within inches of it now
where you were 10's of feet away formerly).

73's
Richard Clark, KB7QHC