The "witches hat" as you call it makes an excellent top loading medium for
Marconi antennas. I use them here on an AM tower with great success in
improving the base impedance of a less than 1/4 tower. Care must be taken
that these angled down wires are not to long. (I think 30% of the antena
heigh
For many years my 160m antenna has been a very successful classic 21m
tall Inv L mast with a horizontal loading wire.
The only problem, a big one, has been the loading wire getting tangled
up in the surrounding trees in very windy weather.
Chopping the trees down is not an option and I've had eno