[Fwd: LF: Improved antenna.]
Wed, 06 May 1998 07:46:56 -0400
Mike Dennison wrote:
> A successful holiday weekend chez XDV!
> Having read the various e-mails about effective top-loading, and the
> excellent article in March QST, I decided to do something about my
> inverted-L which has a 10m vertical and 20m horizontal. The
> horizontal comprises three separate wires, joined at the top of the
> vertical, and slopes down to about 7m high at the far end - a tree. I
> have long wondered whether this slope, coupled with the ground
> sloping upwards towards the end of the horizontal, my vertical
> section was effectively shortened.
> To cut a long story short, I spent Saturday up a ladder cutting
> branches off my tree and now have a modified antenna as follows:
> Top section is now horizontal.
> The three wires are joined at both ends.
> My loading coil is at the top of the vertical section.
> Net result: Greater effective height; more current in the vertical
> section; higher impedance (hence less earth loss). Result - one
> S-point improvement in QSOs with G4GVC and G3LDO at abt 100km.
> Mike, G3XDV (IO91VT)