Close spaced multiband antenna
 

Reference: Figure 7-6 of ARRL Antenna Handbook,
Chapter Seven, 19 th edition


For your convienience:
http://www.dixienc.us/7dash6.htm

Has anyone had any luck with this antenna?

I have constructed a similar vertical in a "fan" shape that has
performed well for me but when I start getting the wires this close
together like this the results are unpredictable.

I think this scheme has appeared in the Handbook for many years.

de W8CCW, John Ferrell

In article ,
John Ferrell wrote:

Has anyone had any luck with this antenna?

I have constructed a similar vertical in a "fan" shape that has
performed well for me but when I start getting the wires this close
together like this the results are unpredictable.

I'm currently using a three-wire dipole with wire separation of about
4-5", wires cut for 40/20/10. It works quite well, with acceptable
SWR across each of those bands.

I'd expect the one in the ARRL handbook to have stronger coupling
between the wires, due to their close proximity, and thus more
interaction. Trimming it for proper operation might be trickier, and
it would not surprise me if the SWR bandwidth was narrower than would
be the case for a multiwire dipole with broader separation between
wires.


--
Dave Platt AE6EO
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