The model used for the yagi is far from optimum and contains losses
not likely to be present in a well designed antenna. The losses in
a half size element are typically less than 0.5 to 1 dB unless the
loading/matching circuits have extremely low Q.
That said, Moseley antennas have been found to be quite inefficient in
actual range tests (see the W0AX/K7LXC tribander books) to the point
of showing loss compared to a dipole on some bands.
73,
... Joe, W4TV
On 1/10/2016 9:27 AM, dw wrote:
I read an interesting article in eham where EZNEC was used to compare a
specific commercial beam to a dipole.
I guess I was a little surprised at the results.
The article is here.
http://www.eham.net/articles/35421
It goes to the question of whether or not a given antenna solution
represents an improvement significant enough to warrant investment.
I wonder how others formulate return on investment considerations.
Perhaps years of experience, and some "been-there-done-that", have
allowed you to develop some golden-rules about antennas?
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