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The 5/8 vertical is half of a EDZ in length. It uses a different matching network instead of the twin lead and a 4:1 matching balun that is typicaly used to match a wire EDZ to coax.

I expect to have to do some tuning or matching if I add a 5/8 skirt of radials, but maybe not.

I suspect the metal mast or the surface of the coax shield (like a RFD, resonant feed line antenna) might be making up the "other half" of an EDZ with the 5/8 wave vertical anyway. That may account for the common mode currents on the coax surface that are so typical with that type of antenna.

I think that a 5/8 wave skirt of radials may improve the radiation pattern over a random length mast or coax surface currents. But I don't know if it is worth the trouble. I am hoping to hear from somebody who may have had some experience with it.

Thanks for your observations.

<blockquote data-quote="blue runner" data-source="post: 434858" data-attributes="member: 26460">The 5/8 vertical is half of a EDZ in length. It uses a different matching network instead of the twin lead and a 4:1 matching balun that is typicaly used to match a wire EDZ to coax.I expect to have to do some tuning or matching if I add a 5/8 skirt of radials, but maybe not.&nbsp; I suspect the metal mast or the surface of the coax shield (like a RFD, resonant feed line antenna) might be making up the &quot;other half&quot; of an EDZ with the 5/8 wave vertical anyway. That may account for the common mode currents on the coax surface that are so typical with that type of antenna.I think that a 5/8 wave skirt of radials may improve the radiation pattern over a random length mast or coax surface currents. But I don&#039;t know if it is worth the trouble. I am hoping to hear from somebody who may have had some experience with it.Thanks for your observations.</blockquote>

[QUOTE="blue runner, post: 434858, member: 26460"] The 5/8 vertical is half of a EDZ in length. It uses a different matching network instead of the twin lead and a 4:1 matching balun that is typicaly used to match a wire EDZ to coax. I expect to have to do some tuning or matching if I add a 5/8 skirt of radials, but maybe not. I suspect the metal mast or the surface of the coax shield (like a RFD, resonant feed line antenna) might be making up the "other half" of an EDZ with the 5/8 wave vertical anyway. That may account for the common mode currents on the coax surface that are so typical with that type of antenna. I think that a 5/8 wave skirt of radials may improve the radiation pattern over a random length mast or coax surface currents. But I don't know if it is worth the trouble. I am hoping to hear from somebody who may have had some experience with it. Thanks for your observations. [/QUOTE]

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