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Apr 3rd 2012, 19:59


Joined: Apr 19th 2009, 19:30
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On a 5/8 wave vertical antenna should the radials be 1/4 wave 5/8 wave or the longer the better ? Danny K5DRS
Apr 4th 2012, 00:25


Super Moderator

Joined: Apr 4th 1998, 00:00
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The theoretical advantage of a 5/8 wavelength antenna over a quarter wave antenna requires a very large ground plane--the longer the radials the better. Studies have shown that the advantage goes away for small radial systems.

Zack Lau W1VT
ARRL Senior Lab Engineer
May 11th 2012, 01:32


Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I agree, the longer the better if you want a ground system. Shorter radials can become part of the radiating system itself. The radials for my multiband vertical are a ground plane for 10-15-20 with little affect on SWR (mostly angle). However, because of the length I've chosen they become "elements" on 40, which does directly affect my SWR. On 80-meters they don't seem to do me any good at all.

Try using the EZNEC programs to experiment. With that you can also raise your system up and down relative to ground.

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