I have checked out the info on the VB66DX and it appears to be the beam using the 5/8 sleeves on the 7/16 elements, not the one without the sleeves. I am pretty sure that the beam I have is the predecessor to the VB66DX. The info I need will show a beam with 7/16 elements inserted directly into the boom to element clamshells without 5/8 sleeves. 73, Dan, N5AR