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The "delta wings" appear to be capacitance hats. Per Ken Nist's glossary at

Capacitance hat - This is a device sometimes found at the end of an element. It can be a cross, a disk, a ball, a loop, or just about anything conductive. It makes the element behave as if it is longer, maybe 10%-30% longer than it really is. It can save space with almost no drop in performance. Capacitive hats are uncommon in TV antennas. (The Channel Master 3671B has six capacitive hats.)

what are the multiplex directors
Hmm, never heard of such a thing. Maybe someone can explain it.
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