[CQ] Antenna commentary

[Adam J. O'Donnell]

Yeah, I can feed them with two different runs of coax, so there is no
real need for a diplexer.  Also, I am curious as to what a HF/VHF
diplexer would look like.  The only ones I have played with were small
distributed element ones that operate in the GHz bands.

I did build a J-Pole out of twin lead that was used to feed rabbit
ears on a TV when I was 15, and I remember getting decent performance
out of it.  I saw another suggestion of a tuned dual band j-pole
further down in the thread which may be interesting too.

Adam

On Thu, Mar 29, 2012 at 12:30 PM, Jonathan Lassoff <jof at thejof.com> wrote:
> On Thu, Mar 29, 2012 at 12:14 PM, Jordan Hayes KG6UAE <kg6uae at arrl.net> wrote:
>>> - I don't want to be spotted as a nerd from google earth.
>>> - I would like HF and VHF/UHF coverage.
>>
>> I think these two are mutually incompatible :-)
>
> Well, not entirely.... there are ways to share infrastructure for two antennas.
>
> If coax path space is tight, you can use a diplexer for two different antennas.
>
> For space constrained HF, Moxons and capacitively-tuned loops are
> compact and have a little bit of gain. Wire antennas can also be setup
> somewhat discreetly. The G5RV is a cheap and simple multiband antenna.
> The Buddipole is a portable tripod thing that's pretty neat.
>
> For VHF on the roof, a J-pole is nice. It's compact and has a little
> gain over a basic groundplane.
>
>
> If you're interested in antenna projects in general, back issues of
> QST magazine and ARRL articles have all manner of neat stuff.
>
> Cheers,
> jof



-- 
adam j. o'donnell, phd