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Author Topic: End fed 1/2 wave antennas  (Read 1315 times)
KB9CRY
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« Reply #15 on: August 30, 2007, 05:30:48 PM »

I thought the subject at hand was the statement that if one feeds a dipole, which be definition is two pieces of wire connected to the feed line in the middle (or near the middle for off center fed dipoles), at the end of one of the pieces of wire, that a ground plane is then not required.

However a dipole does not need a ground plane to work (like a vertical) so nothing is proved by feeding is at the end because you don't need that ground plane in the first place.


Any antennas near the ground (or a set of radials) will be affected by that.  Further away, then it starts to have little affect.
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KG6AF
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« Reply #16 on: September 10, 2007, 06:39:14 PM »

Here's a second vote for the Par Electronics end-fed half-wave wire antennas.  I have a 20M version that works very well, especially considering that it's just 8 feet above the roof.

From what I've read, the impedance of the end-fed half-wave is around 5K-ohms; you need a counterpoise but it doesn't have to be all that long, because you're not injecting all that much current into what is a high-Z point (the voltage, on the other hand...).  Par provides a small matchbox, which I assume includes a counterpoise or equivalent.

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