The OB16-3 is 16 physical elements, 8 on 10, 4 on 15 and 20, si it is designed to be better than the Th7, and is also more expensive. It is also more broadband than the Th7. With the TH7, I was just another call in the pileup from Dallas; with the OB16-3, it's rare I am beaten in a pileup, even by the East Coast. 73 Barry, W5GN