On Wed, 15 Dec 2004 15:31:14 GMT, John wrote:

1. What verticals are recommended these days?

Hi John,

Just put up as much vertical tubing as will support itself, insulated
from the pole.

2. With the vertical up about 18', what about radials?

Use the pole as the one and only radial. You would then have a
vertical offset dipole with one end grounded. I've never seen a name
put to this, but as an ad-hoc antenna, as good as any. If you want
more radials, simply tie them in at the bottom of the pole, buried
into the ground about an inch or two (or even tacked down along the
ground every 6" to a foot or two depending upon vegetation/grass
coverage - more grass, less tacking). Don't worry about more than 10
or 20 of 1/8 wavelength of the lowest frequency.

3. What suggestions for coax transmission line to make that long a run?
I was thinking I would put it in Schedule 40 PVC pipe sealed as if it
were carrying water, and bury it.

Seal it only at the highest point so that it can drain when water gets
in (it will). Always choose a pipe several times larger than your
first guess and use sweeps at the bends instead of elbows.

An alternative is to electrically tie the tubing to the pole, and
Gamma feed the pole. Same advice about ground goes. One problem is
that this one size fits all (roughly 40M and up if the whole thing
stands some 30-40 feet tall) is that the higher bands will radiate
higher and higher into the sky. You might, then, want to use the pole
to support yard-arms that hold different radiators out and a way from
the pole and each other (one reason why you had that bigger pipe
installed for each of their feeds).

73's
Richard Clark, KB7QHC