Please Comment /Rate this 40M TriLoop Layout

[K4IMZ]

I'm looking for a 40M loop design , coax feed, for daytime stateside contacts.

As my space and hired help are limited, like my physical abilities, it's past the point of experimenting with designs.

I have the space and anchor trees for this design, however I question the 10f high feedpoint and the 50 ohm direct feed. since it's vertical does that eliminate a loop antenna's 100 ohm f/point impedance ?



I'm almost sure it's broadside orientation , and would it share a vertical's higher static noise floor..?

Any and all comments / suggestions will be Greatly Appreciated .

73, K4IMZ

[Ed/KB1HYS]

Looks like it will perform about like a dipole with abit of a null on the vertical end. Feed point impedance was calculated to be just above 50 ohms so it should work ok with coax feed. Plots from EZNEC attached.  Note, the first pattern is horizontal with the point facing upwards.  The vertical pattern is showing the side lobes (looking along the antenna length).
Looks like you may want to point it at an area of interest, and use the null to cancel out noise or at least not facing into an area you want to work. 

The VSWR plot gives you an idea of the input impedance.  Of course these are just calculated values and your installation and area around the antenna will change its performance some...

[K4IMZ]

Looks like it will perform about like a dipole with abit of a null on the vertical end....

Ed, Thank you for the reply and the plots. I think it would be better using the wire in a horizontal square "loop" fashion either with a 4:1 balun or a matching stub of 75ohm coax.

I thank you again,

k4imz

[Ed/KB1HYS]

Good Luck with the Antenna OM.