LDF4.5-50 is a real Andrew/Commscope part number. The Ø5/8 Heliax is now discontinued. John KK9A Rob Atkinson K5UJ wrote: Vol 262, Issue 4 <snip>. BTW Andrew AFAIK made LDF4-50 and LDF5-50 but I never heard of this LDF4.5 stuff. Is that just some ham's invention? 73 Rob K5UJ