Topband: LU5OM shortened dipole (inverted vee) doing a nice job
rxdesign at ssvecnet.com
Tue Jul 25 08:21:27 EDT 2017
that’s a pretty ‘general’ statement! I had a 90’ high inverted L with the bend supported by a tower – it was only about 50’ from a 143’ tower ... it had ~30 100’ radials under it ... and I managed to work 100 countries in 89 consecutive days - from Arizona! That included some pretty rare/distant entities. It worked VERY well as far as I was concerned.
I say this only so that someone reading your comment, having only this as an option, isn’t dissuaded from trying it ... if it is what you have available – go for it!
As for comparing a V at a low height (for most everyone it WILL be at a low height) to a vertical and saying the V was better would, I believe, suggest a feed system issue I’d think on the vertical. I’d think it would beat out a horizontal, for long distance DX, most of the time – and substantially at that. The vertical that is. OR the ground losses are really substantial. Or both.
Just because DX is worked using a low horizontal antenna doesn’t imply something is “good” ... it only implies it is sufficient. “Good”ness is very subjective.
but as they, as we all say – do what you have to ...
They don't do well if the bend is supported by a tower, or if there are
nearby "weed" parasitic elements from 40 and 80 dipoles/vees lacking the
blocking to isolate them on 160. L's don't do well if there are trees
inside the bend. Also an L over radials will have quite a bit more current
in the radials beneath the horizontal. This unbalances the efficiency of
the radials as normally found beneath a T or straight vertical.
Comparing an L to an inverted vee on top band is a pretty murky subject.
Some would say that arrival angles via grey line propagation can be quite
high, and thus a high angle antenna might be a lot more useful if grey line
is a frequent mode. There is also a useful NVIS mode that is rarely touted
for DX, but would come into play comparing vee's to whatever if shorter
distances are important.
73, Guy K2AV
More information about the Topband