When both antennas have about the same height at their centres -


A half-wave vertical is better at low elevation angles.


A half-wave horizontal dipole is better at high elevation angles.


There's nothing at all to choose between them at 45 degrees.


For each of the following factors allow a predicting uncertainty of +/- 1/2
S-unit -


MF, HF, sun-spot cycle numbers, day, night, summer, winter, aurora, N/S,
E/W, giro-magnetic disturbances, high-rise city centers, arid deserts, the
oceans, mountain ranges, prairies, pampas, steppes, tropics, arctic
regions, G5RV's and unsociable noisy neighbours.


Use RMS summation of predicting uncertainties.


If you are using Roy's S-meter calibration multiply by 2. ;o)


And that just about sums it up.
----
Reg, G4FGQ

--
.................................................. ..........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. ..........
"Richard Clark" wrote in message
...
On Sat, 3 Jan 2004 10:35:51 -0600 (CST),
(Richard Harrison) wrote:

If the signal must take a great circle route over
the North Polar region, problems increase.

Hi Richard,

This is a S+N/N problem, not propagation. It is not like the magnetic
pole is sucking signals into the ground. What the pole IS attracting
is the ionic flow from the sun's emissions which create a plasma of
noise.

73's
Richard Clark, KB7QHC