There are some other advantages to the 8JK antenna that are not so
obvious:

1. You don't need to worry about whether a DX station is coming in via
long or short path, since you get them both at once, and the strongest
one wins.

2. You can investigate propagation to various parts of world by
listening for your own round-the-world echo in various directions.

I was a colleague of John Kraus W8JK for many years, and he used to tell
me about his round-the-world experiments. I was in his shack once when
he did it. Of course you need rapid switching to go from transmit to
receive. Typically a single dit is used.


Bob W8ERD