Ken Bessler wrote:
The question still stands - would adding a 4:1 balun at
the transition between coax and ladder line improve the
system or is a coax choke good enough?

The highest impedance possible with an SWR of 2:1 is 100
ohms. All impedances that cause an SWR of 2:1 or less, in
a 50 ohm environment, are less than 100 ohms. Therefore,
a 4:1 balun would yield the same SWR for 100 ohms and a
worst SWR for all other impedances less than 100 ohms.
A 4:1 balun is a bad idea in this case.
--
73, Cecil, W5DXP