[Antennas] 40m mobile antennae.r.p. compared

Sat Apr 30 23:59:25 EDT 2005

> At 12:39 PM 4/30/05, Sam Morgan wrote:

> Try an Isotron antenna as advertised in QST. They are a balanced antenna 
> which means you don't need any radials. 

That you could work out on 20 up does not surprise me at all, but i am 
curious how this small antenna worked on 40 and goodness, even 80.
I suspect quite a bit like a mobile whip at those freqs. One advantage,
I think at least, over a mobile whip and ground wire, in the apartment
environment, is that you can maybe move the antenna kinda away from
noise sources, while a ground wire ( radial ) has to meander around near
all kinds of appliances. 
If one has time to build, i'm sure a helical wound balanced vertical mast
antenna would work just as well as the Isotrons and take up hardly any more 
space, being just an inch or a few wide and maybe 7 ft tall. -Hue Miller