"Bob Lewis (AA4PB)" wrote in message
...
The twist improves the ability to reject noise and signals picked up
by the balanced feed line but even untwisted, parallel lines do quite
well. It is the fact that any signals are picked up by both lines
equally and then cancel at the receiver input because they are in
phase.

And low impedance lines are very close spaced so that the twisting is less
of an advantage.