[Elecraft] Balun with a G5RV?

[Tom Crites]

I am using a G5RV antenna with my K2 (with KAT2 tuner) fed with 60 feet of 50
ohm coax.  I've been trying to figure out if I need a balun between the 450
ohm ladder line and the coax.  Will a balun improve the antenna performance
or just help keep RF out of the shack?  My existing setup with no balun is
marginal on 10 meters.  With the G5RV I've seen suggestions just needing just
a tuner, to a 1:1 air-core choke balun, a 4:1 balun, 75 ohm coax,...., etc.

73,
Tom, KC8SES

p.s. I did put a Solarcon A99 this weekend!