It can be as simple this – another easy one – drive 2 four foot ground rods in about 30 feet apart – why he is using a balun / unun and not the 500 ohm connection point on the Eton 750 I couldn’t say – guess anybody? – out camping one time and laid about 300 foot of speaker wire out in a big rough circle – worked pretty good actually . . .
Sometimes the stupidly simple stuff works – sometimes it don’t . . .
Have Fun! – Run the Gun! – and remember – Fish Heads are Cheap!!