[Elecraft] Using the Antenna Tuner in the XPA100

[Wilson Lamb]

This is so far off the wall it can't be answered...there is no answer. 
Please read my rant on Ham Qualifications. 
Then ask yourself why the tuner might have a two wire output connection. 
Then read about what impedance is. 
Then read about what the impedance at the end of your wire might be. 
The answer is that it can be too high for your tuner or too low and anywhere in between. 
Then read about matching networks and what they do. 
Then read about how the end fed wire needs to be used with a ground of some kind. 
You'll soon see, if you do the above, that what you propose is a recipe for getting an RF burn, confusing your internet modem and phone system, or even damaging your radio or tuner. 
  
The real best answer is to get a manual tuner, connect the antenna AND A GROUND (rod) and learn to use it. 
Yes, the auto tuner "can" work, given a ground, but it pretty surely won't work on all bands. 
The end of the antenna and the tuner "should" be well up above your radio, like at the top of a window, and connected back to your station with coax. 
  
Someone here may have time to explain all of the above to you, but it's a tall order. 
WL