I don't think so, Tim. If I understand Carl, he's describing two ground planes - one above the other - and the pattern/gain would depend on the phasing between the two feeds and the vertical separation between them.
Regards, Charlie, K4OTV -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Shoppa, Tim Sent: Thursday, September 05, 2013 10:30 PM To: Carl; [email protected] Subject: Re: Topband: Are stacked verticals feasible? Isn't this a "Vertical dipole"? Two quarter wave radiating elements? And tower behind it will be some kind of reflector/director depending on height. The radials seem unimportant if thought of this way. Tim N3QE ________________________________________ From: Topband [[email protected]] on behalf of Carl [[email protected]] Sent: Thursday, September 05, 2013 9:17 AM To: topband Subject: Topband: Are stacked verticals feasible? Assuming that sufficient tower height was available, guy wires are insulated or broken up into short non-resonant sections. Tower face is 12 or 18". Start at 1/4 wave up with a 1/4 wave ground plane with radials sloping at about 45 degrees. The vertical wire is 6-12' away from the tower face. Then a 1/4 wave (or 1/8) up install a duplicate. What does EZNEC say about this? With the different spacings? Effect of starting lower and how low before there are ground related problems? Phasing with coax or a LC network? Switching in a delay line to tilt the lobe up a bit? Curiosity got the cat! Carl KM1H _________________ Topband Reflector _________________ Topband Reflector _________________ Topband Reflector
