Topband: T-antenna dimensions?

Herbert Schoenbohm herbs at vitelcom.net
Wed Jan 20 01:34:43 PST 2010



Mike Waters W0BTU wrote:
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> Basically, I don't have trees on the hill far enough apart for the T-section, unless I fold it back on itself and/or load it with a hi-Q coil. I'll try and model that in EZNEC+, which I just purchased but haven't learned yet.
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> Mike,
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    A folded back multiwire top hat will give you a larger top hat area 
and reduce the length required for the top wire.  This was a common 
Marconi antenna idea in the 20's with two three and even four wires 
folded back.  A spreader of 10 feet on each end of your supports allows 
the construction of a much shorter top  hat. It is old school but works 
and is better than the coil at the base.
> Herb, KV4FZ
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