Hi Mike, Which ones are these then? The LW ones?
I though the MW ones had already gone, they had Two sets for different directions

Below... History of Luxembourg ...(Don't watch video,if you don't like heights)
https://today.rtl.lu/entertainment/news/a/2055599.html

Scroll down to the Black & white photo, showing Inverted "L"....and next to it,
is that a similar "7" layout. as used on Laser ship, with the sloping Vertical
going to One End of the "capacity hat" (Not to its centre) giving a longer Horizontal section
with the Same spacing of support masts, easier to get to resonance, with less wasteful base loading coil

more History...http://www.radioluxembourg.co.uk/?page_id=2 https://h-europe.uni.lu/?page_id=3489

"Luxembourg effect" https://swling.com/blog/tag/luxembourg-effect/

Wiki on Luxey... https://en.wikipedia.org/wiki/Junglinster_Longwave_Transmitter

Rod Watts