Hi Roger there is probably less volts on the vertical section so you are
losing less by capacitive coupling to the surroundings too. Well done!!
...but watch the wind it a killer with that format aerial.

Alan G3NYK

----- Original Message -----
From: "Roger Lapthorn" <[email protected]>
To: <[email protected]>
Sent: Friday, November 06, 2009 4:45 PM
Subject: LF: G3XBM: 500kHz ERP increased by 6dB - WSPR reports please


> Today I modified my 500kHz antenna. The 28MHz halo up at the top of the
5-6m
> vertical section (which was the coax feed to the 28MHz halo) was removed
and
> replaced by a spiral inductance/ top capacity hat consisting of around
> around 8 "spiralling in" turns in the space occupied by the original halo.
> Seeing my initial reports from M0BMU I am some *5-6dB stronger* than I was
> before, I guess because more of the antenna current is in the vertical
> section. The measured antenna current is not much different though.
>
> *Please listen for me on 500kHz WSPR* and let me know if I am now stronger
> than before.
>
> 73s
> Roger G3XBM
>
> --
> -------------------------------------------------------------
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> G3XBM    GQRP 1678      ISWL G11088
>