More 5/8 research ....

There are some big problems with the previous blog entry so as much as I really thought it would make a great antenna.  Here is another take ...

5⁄8-Wavelength verticals
Figure 7-14 shows the configuration for the 5⁄8-wavelength vertical antenna. Such an
antenna generally gives a lower angle of radiation than the more common quarterwavelength
radiator, so presumably it works better for long distance.
The radiator of this antenna is made from 0.5-in to 1.5-in aluminum tubing.
Again, remember that adjacent sizes fit together snugly to form longer sections.
The physical length of the 5⁄8-wavelength radiator is found from


Lft=585/FMhz or Lmeters=180/F Mhz


The radials are the usual quarter-wavelength, and are made of no. 12 or no. 14
copper wire. These lengths are found from:

Lft=246/FMHz

The feedpoint impedance of the 5⁄8-wavelength antenna is about 1600Ω, not a
good match for the ordinary coaxial cables that are routinely available on the amateur
market. Some form of impedance matching is needed.
One option is to use a broadbanded RF transformer. These transformers will
work throughout the HF spectrum, and match a wide variety of impedances to the
50-Ω standard system impedance.
Another option, especially for a single-band antenna, is to use a coaxial cable
impedance transformer, such as shown in Fig. 7-14. The transformer consists of two
sections of coaxial cable joined together, shown as L1 and L2 in Fig. 7-14. The
lengths are found from

L1 ft = 122/F MHz  

L2 ft = 30/F MHz

Or use a "Q section  "  L Meters =75/F MHz