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Jpole radials
Yes, a ground plane antenna has a low feed-point impedance because it is fed at a current loop, and that's because the antenna is a 1/4 wave length, or some odd multiple of 1/4 wave length. A J-pole is an end-fed 1/2 wave length antenna, making its input impedance and its radiation resistance...- HarryUSA
- Post #9
- Forum: Amateur Radio Antennas
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understanding the A99,, the 1/2 wave over 1/4 wave bit
While this is an old post, some things need to be addressed. First, the Antron 99 is a 1/2 wave antenna, and if anyone said that someone calls it a 1/2wave over a 1/4 wave, I can only imagine they were referencing the input impedance is the same as a 1/4 wave ground plane antenna, because a half...- HarryUSA
- Post #28
- Forum: Amateur Radio Antennas
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Jpole radials
The base of a J-pole is a high current point and if you're too close to ground, that current will couple with ground and/or your radials. So in conclusion, there would be no good that would come from radials, only height would help.- HarryUSA
- Post #5
- Forum: Amateur Radio Antennas