[Lowfer] Alphas

[Douglas D. Williams]

Yes, loops have the big advantage, in my experience, of being less
sensitive to being in close proximity to foliage, as well as having the two
deep nulls that you can use to your advantage to null out QRM. I just hate
dealing with rotors. At my location, the trees don't seem to desense the
antenna very much, especially in the winter when the leaves are off and the
sap is down. But anyway, my wife informed me yesterday that she wants me to
clean out the wooded part of our property, so after I get that accomplished
I may see some improvement.

I'm not sure if it's really an advantage on LF or VLF (though it certainly
is on VHF), but I live at the very top of a hill, at about 1700 ft (perhaps
300ft above the bottom of the hill).

Doug



On Sat, Dec 31, 2011 at 9:16 AM, Dexter McIntyre W4DEX
<dexter.mc at gmail.com>wrote:

> Douglas D. Williams wrote:
> > I could easily raise the base
> > of the antenna up to 30' by adding another couple of sections of TV mast,
> > but Jack said there was no advantage to raising the antenna higher.
> >
> >
> Doug,
>
> Thanks for the reply and photos.  I've had very poor results with active
> antennas unless it was placed at least as far away form trees as the
> height of the trees.  The only open area I have is a field between my
> house and the road where a 45 KV power lines runs.  When I get away from
> the tree line the power line noise gets worse.  The Clifton Labs antenna
> is very likely superior to any of my home brew active antennas so that
> is probably the difference.  Guess I'll have to stick with wires and
> loops unless I can get an active antenna out the top of a 75 foot tall
> tree behind the house.
>
> Dex
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