[600MRG] Free standing verticals

[Edward R Cole]

I checked out the MBVE-5A in 43-foot version.  Self-supporting to 
92mph winds and has insulated base.  The you need a top hat wire or 
wires (probably the fiberglass fishing pole will work.  If you have 
room, two of them to make sloping Tee antenna.  Once you have the 
numbers on height and run of wires you can model it to find the 
inductance needed to load it on 630m.

I have more room 200 x 300 feet (1-3/4 acre) so I have two 50-foot 
Rohn25 towers spaced 130-foot apart.  My vertical is 43 foot and 
horizontal is 122-feet.  EzNec5 gives 668 ohms inductance for my 
invert-L.  Your top hat is likely shorter so more inductance would be needed.

The MBVE-5A has a lift kit that might be handy getting raised.  Looks 
like a good solution for a vertical

73, Ed - KL7UW

At 08:10 PM 2/7/2018, Ben Gelb wrote:
>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 
><<mailto:dave.riley3 at verizon.net>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?
>
>
>
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73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com 
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