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Using 1/4 wave length radials AND isolating the antenna from the mast has been done by Hams with this antenna. Just look up the A99 on eHam and read some comments there. Anecdotal evidence at best - BTW. Some guys have used 1/4 wave length radials for 20m and have made it work with a tuner. Same with 17m and 15m too. Not that I would do that with it; there are better ways to get on 20m than a vertical built primarily for 10m, 11m, and 12m respectively. . So, using a 'slanted' 1/4 wave length radials for 11m should be best. Or perhaps horizontal radials; whatever looks best with EZNEC radiation pattern - I guess . . .

Simply put, because it needs that much counterpoise to balance the vertical for the freq being used. The RF on whatever freq will need it. If it isn't there; then it will end up using the coax as the counterpoise. Found that out when using it on 17m - BTW. I don't know about the claims of 2 S-units gains previously mentioned though, unless the antenna was already otherwise compromised in some way. AS in - having no radials at all.

<blockquote data-quote="Robb" data-source="post: 346976" data-attributes="member: 8446">Using 1/4 wave length radials AND isolating the antenna from the mast has been done by Hams with this antenna.&nbsp; Just look up the A99 on eHam and read some comments there.&nbsp; Anecdotal evidence at best - BTW.&nbsp; Some guys have used 1/4 wave length radials for 20m and have made it work with a tuner.&nbsp; Same with 17m and 15m too.&nbsp; Not that I would do that with it; there are better ways to get on 20m than a vertical built primarily for 10m, 11m, and 12m respectively. .&nbsp; So, using a &#039;slanted&#039; 1/4 wave length radials for 11m should be best.&nbsp; Or perhaps horizontal radials; whatever looks best with EZNEC radiation pattern - I guess . . .Simply put, because it needs that much counterpoise to balance the vertical for the freq being used.&nbsp; The RF on whatever freq will need it.&nbsp; If it isn&#039;t there; then it will end up using the coax as the counterpoise.&nbsp; Found that out when using it on 17m - BTW.&nbsp; I don&#039;t know about the claims of 2 S-units gains previously mentioned though, unless the antenna was already otherwise compromised in some way.&nbsp; AS in - having no radials at all.</blockquote>

[QUOTE="Robb, post: 346976, member: 8446"] Using 1/4 wave length radials AND isolating the antenna from the mast has been done by Hams with this antenna. Just look up the A99 on eHam and read some comments there. Anecdotal evidence at best - BTW. Some guys have used 1/4 wave length radials for 20m and have made it work with a tuner. Same with 17m and 15m too. Not that I would do that with it; there are better ways to get on 20m than a vertical built primarily for 10m, 11m, and 12m respectively. . So, using a 'slanted' 1/4 wave length radials for 11m should be best. Or perhaps horizontal radials; whatever looks best with EZNEC radiation pattern - I guess . . . Simply put, because it needs that much counterpoise to balance the vertical for the freq being used. The RF on whatever freq will need it. If it isn't there; then it will end up using the coax as the counterpoise. Found that out when using it on 17m - BTW. I don't know about the claims of 2 S-units gains previously mentioned though, unless the antenna was already otherwise compromised in some way. AS in - having no radials at all. [/QUOTE]

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