## The
WB0DGF / W8IO Antenna Site - Download Page

(18 June 2014)

My
current software (zipped files)

144
MHz long Yagi NEC files

- WB0DGF-215DX
a 16.35 dBi, high G/T Yagi for 144.1 MHz on a 27.5 foot boom (metric
dimensions)
- WB0DGF-28DX
a 13.4 dBi low backlobe Yagi for 144.1 on a 12.5 foot boom
- DK7ZB-144-12
a
16.5 dBi, high G/T Yagi for 144.1 MHz on a 26 foot boom (metric)
- YU7EF-EF0213
a
16.22 dBi, high G/T Yagi for 144.1 MHz on a 26.7 foot boom (metric)
- YU7EF-EF0215
a 17.0 dBi, high G/T Yagi for 144.1 MHz on a 33 foot boom (metric)
- SM5BSZ-2SA13 a 16.6 dBi, high G/T Yagi for 144.1 MHz on a 27.4 foot boom (metric)
- K1FO-FO15-144 a 15.97 dBi, high G/T Yagi for 144.1 MHz on a 24.8 foot boom (metric)
- K1FO-FO16-144 a 16.33 dBi, high G/T Yagi for 144.1 MHz on a 27.4 foot boom (metric)

The VHF antennas shown above include the "raw" element lengths.
That
is, the element lengths are those used with a wood or plastic
(dielectric)
boom or supported above or below a metal boom with an large insulator.
To
convert these raw lengths into actual lengths used when passed through
the
center of metal booms, you need to add a correction factor, based on
whether
the element is insulated and passes through the center of a metal boom,
or
is shorted directly to the metal boom with a clamp. If the
element is insulated when it passes through the metal boom, the
correction
factor is approximately 1/4 the diameter of the boom. For
example,
for a 36" (raw length) insulated element passed through the center of a
1"
metal boom, the correction factor is 0.25", so the actual length should
be
36.25" when built.

link to NEW W8IO site

Comments
are welcome!

contact
Roger: email to

rgcox2
(at) gmail.com

Roger Cox - Grand Haven, MI