[Elecraft] OT: Vertical doublets (was: Home made Sigma-GT5 & KRC2 or SGC?)

[Ron D'Eau Claire]

I wasn't aware that there was a "loss", but there is GAIN of a =
horizontal
antenna at a proper height above ground compared to a vertical. That is
caused because the horizontal forms a two-element parasitic array with =
the
earth. The angle of the main lobes from this array vary with the antenna
height.=20

For example, plugging a vertical into EZNEC working against a "typical"
ground will show just about 0 dbi at the peak of the lobes which are at =
26
degrees above the horizon.=20

A horizontal half wave at 1/2 wave above the ground has about 5.4 dbi =
max at
42 degrees above the horizon. To compare apples and  apples, the =
horizontal
at the same elevation as  the peak of the vertical's lobes - 26 degrees =
-
shows 4.3 dbi or 4.3 db more gain than the vertical at the same angle.=20

The reflection gain is what makes low horizontal antennas such superb
performers for short-haul conditions. As the antenna is brought down to
about 1/4 wave above the earth, the lobe moves straight up and shows =
more
than 6 dbi. Great for NVIS operation.=20

Ron AC7AC


-----Original Message-----
Guy,
I cannot find your assertion of 3dB loss from a vertical dipole =
supported in
any of the antenna literature. (Some dozen books or more)  Do you have a
reference book? Thanks, Stuart K5KVH