[600MRG] Free standing verticals

[Ben Gelb]

Thanks all for the replies.

Yard is 30' wide by perhaps 45' deep behind my rental house in San
Francisco. There is one tree of substantial height (the one thats going
away) on one corner of the yard (up against mine and my neighbor's house on
the east side of me). That currently gives me about 30' of vertical for my
inverted L, and then I have a fiberglass fishing pole supporting the end of
the top-hat about 30' away from the vertical. (this inverted L is my only
transmitting antenna currently, but for MF and HF - I also have a couple of
small receiving loops on a rotatable base at ground level)

With the tree gone will need to provide my own structure, and I would
prefer to avoid a lot of guying if possible, as there's not a lot of room
for it, and it will really consume the entire yard. I was thinking to sink
a 4x4 or 6x6 post into the ground (i have a post-hole digger) and then
maybe attach some sort of mast to it, hopefully stiff enough to not need
any guying (or at least not much). Alternatively, the DX Engineering
MBVA-5A looks like it might be a reasonable option, albeit perhaps a bit
more expensive than some home-depot option (ostensibly it doesn't require
guying).

If I were to kludge up some set of metal pipes and tubes, I wonder how I
might mount it to a wooden post - I'm thinking a wooden post might not be a
great dielectric (tree sure wasn't) and might lead to some burning. Anybody
tackled that problem?

I do have some of the 4' military mast sections (mine are aluminum not
fiberglass though) but I think they'll get pretty floppy over 15-20' or so
w/o some guying...

Neighbor mentioned being open to draping a wire over his house if it
helped.... but I think more useful would be expanding the radial field
throughout his backyard... haven't broached that subject. He might be less
excited about that.



On Wed, Feb 7, 2018 at 5:35 AM, Dave Riley <dave.riley3 at verizon.net> wrote:

> Hello Ben,
>
> Can you give us more info concerning your real estate plot such as square
> footage, relationship to power lines, existing antennas, size and height of
> your home, any neighbors who would allow you to span their property, or any
> obstructions that would be in the way of an antenna and lastly what you
> have for antennas for ham use at this time?
>
> Are you presently using any sort of loop or probe antenna for receive?
>
> All the answers to your quest so far sound workable so maybe a mix or some
> kind of a modification could allow you to enjoy the new band.
>
> Thanks from DaveR @ aa1a
>
>
>
> On 2/4/2018 7:11 PM, Ben Gelb wrote:
>
>> My neighbor is taking down my antenna tree ... possibly this week :(.
>>
>> Its actually the right thing - the tree is very unbalanced and needs to
>> go. But it means my undersized antenna will be even smaller (gone) soon...
>>
>> Seems like I may need to try to get something in the air that doesn't
>> require a tree or permanent support structure. I can probably fashion some
>> kind of vertical pole out of cheap materials, but imagine it will require a
>> lot of guys to remain vertical - which I'd kind of like to avoid since I
>> don't have a lot of room for guys.
>>
>> Any suggestions from this group?
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/600mrg/attachments/20180207/47730ebe/attachment.html>