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"T" shaped longwire ?	Reply
by SWL177 on August 28, 2008	Mail this to a friend!
Would a T shaped longwire work for HF ? Approx 17m then toped with another 10m . Regards

RE: "T" shaped longwire ?	Reply
by KF7CG on August 28, 2008	Mail this to a friend!
Though not as long in any dimension as you might want this is a "classic" receive antenna design. It works well to the higher impedance input of many of the older SWL receivers. KF7CG

RE: "T" shaped longwire ?	Reply
by WB6BYU on August 28, 2008	Mail this to a friend!
Presuming that you had a good ground connection right at the base (preferably a radial field, either on the ground or elevated) the antenna is self resonant around 3 MHz. Below that it wil need some series inductance to bring it to resonance, but it should receive reasonably well. The pattern is pretty good up to 8 MHz or so, where the antenna is about 5/8 wave. From there performance is usable (though not wonderful) up to about 16 MHz or so. Above that the pattern falls apart and is mostly at high angles that aren't very useful. You can use it for transmitting with a good tuner at the base. If you don't have a good ground system, the efficiency will suffer and you may end up with RF in unwanted places in the shack.

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