[Elecraft] Inverted L for 160 meters

[Wes]

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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