Depending on the height he has available consider using a C-pole.
[QST April 2004] and also found in more detail in the new ARRL Antenna
Designer's Handbook.
Tod, K0TO
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Dan
> Sent: Thursday, March 25, 2010 9:40 AM
> To: Tower and HF antenna construction topics.
> Subject: Re: [TowerTalk] 40/80m dipole
>
> I should have mentioned that the 40/80 antenna for my son
> will be almost vertical. He has a single pulley in a tall
> tree to suspend the antenna.
> I agree that the fan dipole or bent full size dipoles would
> be good solutions but a single 2 band dipole is better suited
> to his needs.
> Thanks for all the comments. I was hoping to get an
> inductance value and location in a 90 ft dipole. Antennas of
> this type are widely available from suppliers but it is more
> fun to build it and he will be visiting in a week or so. It
> makes a nice educational project. I do have an instrument to
> measure inductance at those frequencies.
> 73, Dan
>
> Dan wrote:
> > I would like to build and send to my son a coil loaded dipole for
> > 80/40m. He has about 90 feet space to hang it in. Has anyone
> > information on loading coil values and placement in the 90
> ft dipole?
> >
> > Tnx, Dan, N5AR
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