Appears as though the "DX Commander" is a variation of a fan-vertical antenna offered in 1953 by the Radiotron Designer's Handbook. I feel that W9FFF provides ample citation in his presentation; and the significance of his contribution is found within his ability to 3D print. Additionally, his rendition offers 4 bands. Bravo! Mission accomplished! ARRL's Mission Statement: To advance the art, science, and enjoyment of Amateur Radio!