"JIMMIE" wrote in message
ps.com...

wrote:
On Oct 2, 2:06 pm, "Jimmie D" wrote:


The small theroretical gain advantage that a 5/8wl radiator has over a
1/2wl
radiator is dependent on it having a very good counterpoise. However
one
may be able to fabricate a 5/8wl antenna with a couterpoise matched to
the
feedline with a stub made of metal tubing.

Jimmie
The best "counterpoise" for a 5/8 radiator is a set of 5/8 radials...
But in that case, it's more of a collinear.
Myself, I think a 5/8 radiator should always be used with a 5/8
lower section of you want the full performance. IE: dual 5/8
collinear.
Anything else is a perversion... :/
My 2nd choice would be to use 3/4 wave radials.
1/2 wave radials would be useless.
1/4 wave radials are semi useless, and give a lousy pattern..
MK

I like the 5/8th on VHF because it has noticably more gain than a
1/4wl groundplane and in my opinon is easier to build and match than
an end-fed 1/2wl antenna.

Jimmie



How can it get any easier than what I described in my article about the 2x4
based 1/2 wave J-Pole with the unconnected 1/4 wave matching stub placed 4"
from the 1/2 wave radiator? You slide the alligator clips up and down the
two elements until the SWR matches, then you're finished.

Of course, building a similar antenna for outdoor use will require some
experimentation, but it shouldn't be that difficult to accomplish. The
performance was just fine as far as I was concerned, working distant 30 mile
away repeaters with ten watts or less from INSIDE the house (steel siding -
no less) and obtaining full quieting on the repeater.

Ed Cregger, NM2K