> My particular interest right now is a good antenna for the new 475 khz
> band that is coming. I have a 1000 foot dipole at 50 feet and it
> shows an excellent load at 475 khz. My belief is this antenna will be
> more efficient even at a 20 degree takeoff angle than a 50 foot
> vertical that has a very large and inefficient loading coil and
> radials.
It may model that way but at 475 kHz, surface wave propagation will likely
dominate and the vertical may be the better performer, especially with a
large top hat. IOW, feed that 1000 ft, 50 ft high horizontal wire at the
center (500 ft. per side) and make it into a Marconi "T" over a radial
field.
Paul, W9AC
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