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This is interesting, too.
As you said, the .625 has nothing on the .50 antennas. I'm not surprised, although I likely can't articulate why very well. I simply know that I have tried a huge variety of 11m styles of antennas and sometimes found equal performance from the .50 waves as the longer antennas, especially when mounted at the same tip height.
My theory so far...
When the antennas are laying horizontally they are effectively at the same height. Also, the artificial groundplane the .625 and .25 have are nullified due to the real earth being reintroduced beneath them. I think the out of phase 1/8 wave lower section of the .625 does not contribute to the height either, so with both it and the nullified GP out of effective contribution to more gain over the .50 the two antennas are equal. As for the .25, it is smaller. It will have less gain.
Sound reasonable?

<blockquote data-quote="HomerBB" data-source="post: 706720" data-attributes="member: 8569">This is interesting, too.As you said, the .625 has nothing on the .50 antennas. I&#039;m not surprised,&nbsp; although I likely can&#039;t articulate why very well. I simply know that I have tried a huge variety of 11m styles of antennas and sometimes found equal performance from the .50 waves as the longer antennas, especially when mounted at the same tip height.My theory so far...When the antennas are laying horizontally they are effectively at the same height. Also, the artificial groundplane the .625 and .25 have are nullified due to the real earth being reintroduced beneath them. I think the out of phase 1/8 wave lower section of the .625 does not contribute to the height either, so with both it and the nullified GP out of effective contribution to more gain over the .50 the two antennas are equal.&nbsp; As for the .25, it is smaller. It will have less gain.Sound reasonable?</blockquote>

[QUOTE="HomerBB, post: 706720, member: 8569"] This is interesting, too. As you said, the .625 has nothing on the .50 antennas. I'm not surprised, although I likely can't articulate why very well. I simply know that I have tried a huge variety of 11m styles of antennas and sometimes found equal performance from the .50 waves as the longer antennas, especially when mounted at the same tip height. My theory so far... When the antennas are laying horizontally they are effectively at the same height. Also, the artificial groundplane the .625 and .25 have are nullified due to the real earth being reintroduced beneath them. I think the out of phase 1/8 wave lower section of the .625 does not contribute to the height either, so with both it and the nullified GP out of effective contribution to more gain over the .50 the two antennas are equal. As for the .25, it [I]is[/I] smaller. It will have less gain. Sound reasonable? [/QUOTE]

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