"Jack Painter" wrote in message
news:Ol_xc.9311$K45.4284@fed1read02...

"Richard" wrote

I'm looking to make the center frequency 159 Mhz. So any practical
design
I
suppose is likely to be a VHF yagi not too far removed from 159 Mhz.
My antenna is to be a receiving antenna.

Richard, I thought you wanted a marine-band antenna? The center should be
at
156.300 to 156.800 mHz and will cover above that fine, but not well below
it.

Jack

I'm following two threads with my antenna muses, I don't know which one is
going to come out on top:

engaging in applying scaling, and tackling what is required when changes are
made in element diameter and boom size of a tried and tested *practical
design* one that employs a metal boom,

or following the track that seems to involve simply scaling with a *model*
and the making of other adjustments to the model, (arising from element
diameter changes) where in practical terms the model is sufficiently
equivalent to a "practical design" by virtue of the employment of a non
conducting boom in the construction of the yagi.

But to your point:

Marine band is from 156-162 Mhz. Center 159 Mhz.

"Richard" wrote
I'm looking to make the center frequency 159 Mhz.

Richard, I thought you wanted a marine-band antenna? The center should
be
at
156.300 to 156.800 mHz and will cover above that fine, but not well
below
it.

Jack

But to your point:

Marine band is from 156-162 Mhz. Center 159 Mhz.

Richard, my point was, your antenna will funtion better centered on the
lower part of the band, using any wideband features the antenna has to work
upward in frequency, not downward.

Since DX'g was your goal, why not take advantage of this feature? During
summer months troposheric ducting provides some pretty amazing DX features
in this band. In the states, it is common to for stations to copy traffic
hundreds of miles away when this happens.

Best regards,

Jack Painter
Virginia Beach, Va