https://www.500khz.se/lw.php (Click on Green links at Lower end of Scroll for more info)
Again Inverted L used, with Vertical section at 24 Mtrs (79 feet) giving around 1.5 amps into Antenna
As its a Versatower Ham radio Winch up type hopefully, what might work Even better is...
Instead of such a Huge Red wire Base Loading coil, why not try John H. Mullaney methods...
He was a military antenna expert, working on stuff as low as 50khz, If works that low, LW easier
John Mullaney actually set up the Antenna on the Mi-Amigo, in its life before Caroline got the ship
In case Link below is a bit Teckie for you... The Basic Mullaney idea is...
With the Antenna too short, you need a Huge base loading coil to achieve resonance
this Can mean, there is more current in the Loading coil, than the Antenna itself
which can mean low efficiency, as feedpoint is worst location to put a Huge coil, so...
Consider the Folded Unipole, (Similar to where, the missing Top part of a short Antenna, is replaced
with Sloping Guy wires, connected to the top of the short vertical, and Insulators near Ground level)
A Folded Unipole, takes this further, by Bringing the Sloping top set of guys, down Parallel with Mast
with Arms holding this away from mast, this was how the Mi-Amigo was done off Sweden for Radio Nord.
With the 284 foot Antenna on the Ross, a Tap wire added, to move tap point lower down, on feed cage
The current Orfordness Antenna, is also Shunt fed, but with Mullaney idea of putting the Tap point
at the Very top of the mast, this allows Smaller, or No base loading coil, with Less loss
Advantages are No Base Insulator, less loss, (providing that the earthing system is not too lossy)
https://www.accessengineeringlibrary.com/binary/mheaeworks/c6998919f2d543d9/d3ee93149bb4a9e1db6b8fd8bbd7431285d208c87801af81c1d8332641be9326/book-summary.pdf
Rod Watts
