Jim, I have a 80 meter vertical base fed wire "T" with the top loading
provided by a center fed 30 foot horizontal wire to bring the base
impedance up a bit. I also support a 40 meter single wire vertical from
the same top catenary by fan slopping slightly the 40 meter vertical
wire to the top with a dacron rope to reach the top configuration. It
works very well and is a super DX antenna on these bands with about 30
60 foot radials laying on the ground. I don't see any reason why a
similar configuration would not work on 160/80 meters.
Herb Schoenbohm, KV4FZ
On 11/5/2013 10:27 AM, Jim Garland wrote:
My 160m vertical is 79ft high (wire running up a 26m Spiderbeam fiberglass
pole), with a capacity hat. Is it workable to put an 80m 1/4 wave wire on
the same mast join both antennas at the base, in the same way people make
multiband fan dipoles? The idea would be that when operationg on 80m, the
160m antenna would present a high Z, and vice-versa when operating on 160m.
I don't have a feeling for how much interaction there would be between the
two wires, separated by only a couple of inches. Another option would be to
electrically isolate the wires and select one or the other with a relay. If
possible, I'd like to avoid matching networks and complicated switching
arrangements, because the antenna is 700 ft from my station. Any advice is
most welcome.
73,
Jim W8ZR
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Topband Reflector
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