http://elecraft.85.s1.nabble.com/Inverted-L-for-160-meters-tp7664325p7664342.html
Like N7WS recommended, look up N6LF's work and read it carefully. Seriously.
> I have to be very careful of raised wires on my property. If they are
> not above the height of an elk's antlers I am in trouble. I plan to
> bury them. This is something I've never done before which has its own
> merit. I have plenty of wire scrap from broken antennas so the
> non-resonant, buried radials work better for my circumstances. I need
> to calculate the feed point impedance to see if I need to design a
> balun for the system to work. Once my main project is done I'll have
> more time for modeling each method.
>
> Thanks for all the ideas guys,
>
> 73, Kevin. KD5ONS
>
>
> On 8/25/20 5:23 PM, Wes wrote:
>> You probably should get acquainted with Rudy Severns, N6LF.
>> (
https://www.antennasbyn6lf.com/) He has written more than you ever
>> want to know about vertical antennas,
>>
>> More specifically to your case, are you planning the radials to be
>> elevated? If so, they need to be the same length, in fact some
>> effort should be made to get all of the currents the same. The last
>> thing you want is a fifty ohm feedpoint impedance with a shortened
>> vertical (which is what an L is). There is evidence that elevated
>> radials are an improvement over on-the-ground or buried radials.
>> Mine are on the ground, mainly because 1) I didn't want to give up
>> radiator height to raise the radials, 2) all of the big guns bury
>> theirs and I don't have room for full length radials anyway in my
>> cactus patch. See my QRZ page for evidence.
>>
>> My modeling shows a little bit of directivity away from the
>> horizontal wire, but it's negligible.
>>
>> Wes N7WS
>>
>> On 8/25/2020 4:23 PM, kevinr wrote:
>>> From what I can find, and what I can calculate, five wires, each
>>> ~130 feet long, could make a nice inverted L for 160 meters. One
>>> leg for the vertical and horizontal portion of the antenna. Four
>>> legs for the counterpoise (ground plane). There are many broken
>>> wire antennas stored in my shed which are fodder for the radials. Do
>>> all of the legs for the counterpoise need to be 1/4 wavelength or
>>> can I substitute some shorter lengths? The feedpoint should
>>> somewhere above 50 ohms impedance. As I add more radials that
>>> number will reach 50 ohms asymptotically.
>>>
>>> I can get the vertical part up to 70 or 80 feet above ground with
>>> the rest of it horizontal. Most of the radiation should take place
>>> from the vertical part since it is closer to the feed point. But
>>> there should be some effect from the direction of the horizontal
>>> portion. How strongly does the direction of the horizontal portion
>>> effect the radiation pattern of the antenna system? My property
>>> allows me to point it from 300 degrees around to 200 degrees so I
>>> have plenty of options. Between 200 and 300 degrees there is a road
>>> used by loggers, and the folks maintaining the towers at the top of
>>> this mountain. They can break any antenna lower than 80 feet above
>>> ground. Spar poles and cranes clear out any dead limbs across the
>>> road.
>>>
>>> Inquiring minds...
>>>
>>> Kevin. KD5ONS
>>>
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