[TowerTalk] Balun - ahead or behind?

[Ralph Parker]

 >differential mode loss can be greatly reduced when you put the 
balun/choke in front of the tuner...

I'm confused as to what is 'ahead' and what is 'behind' - it's a matter of perspective, is it not?
Which one is between the radio and the tuner?

I moved recently, and had to give up most of my magazines (eg. paper QST back to 1930),
so I have no access to the N6BV article.

VE7XF