Ralph Mowery wrote:
"Ian Jackson" wrote in message
...
In message ,
writes
Like I said, there is no difference in free space between a V and an
inverted V.
There are slight differences when close to ground.
Assuming it's a halfwave dipole, I would have thought it was better to
concentrate on getting the centre (where the current is) as high as
possible, rather than the ends. [Obviously this depends on whether you
have a suitable sky-hook available for and at the centre.] However, I
believe that there is at least one commercial loaded dipole (essentially
for portable use, I think) that has a short mast, and the ends of the V
are up in the air.
In free space I would not think there would be much of any differance.
Near the ground where most of us are is what we have to live with. In my
back yard I have enough room to string wire dipoles for 80 meters and
shorter. I don't have a way to support the antennas in the middle. I can
go up about 60 feet or so at the ends.
60 feet is good for 30M, marginal for 40M, and crap for 80M and below
for a dipole.
It is also too high for 15M and up.
For best results, a diple should be at .5 labda.
Then again, a marginal 40M dipole is better than no antenna at all.
--
Jim Pennino