I was fortunate enough to get some high-quality PTFE (Teflon) coax (RG-174
sized) SMA to BNC jumpers - and these hold up much better, probably because
they have a small piece of heat-shrinkable tubing at the interface between the
connector and the cable which distributes stress over a larger area
These have heat shrink (one layer) twice the length of crimp ferrules;
34cm is longer than typically needed,
so splurged another ~ US$6.50 on four more with 15cm length.
A source for durable pigtails would be good to know.
Oristo