Is LMR600 or the equivalent too stiff to pass through three 45-degree sweeps in a 4" PVC? How about with an 89' crank-up tower? I am trying to decide whether to reuse my Davis RF Bury-Flex or replace it. This antenna, a 4L SteppIR, will have 6M on it, and I've never had to be concerned with attenuation for that band before. Jim N7US