Topband: Fw: Are stacked verticals feasible?

[Bob Kupps]

Say Paul I am going to try the same setup except ground the 80m vertical as a close (5') coupled radiator and see what the feed impedance of the 160 vertical is on 80. It models well...

On 09/06/2013 09:26 AM, ZR wrote:
> I would think that at 6-12' spacing from the tower it would minimize interaction on 160 or 80?

I don't know, Carl. I'll leave it to the experts. What I do know is 
I have made several attempts to erect a vertical for 80 meters near 
my 160 meter tower, using the same radial system. At 10 foot spacing 
from the tower, the base resistance of an 80 meter quarter wave 
vertical was less than 5 ohms. That to me suggests significant 
interaction with the tower. At 5 foot spacing the base resistance 
was less than 2 ohms! I don't have the data handy but I seem to 
recall having to adjust the length considerably from a quarter 
wavelength to cancel a reactive component.

73,
Paul N1BUG
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Topband Reflector