[Elecraft] K3 & S9 43' Vertical

[tjkelly at windstream.net]

I have just gotten (but have not yet installed) an S9 43' vertical with
optional 80m coil.  I am wondering if I will need an auto-tuner at the
antenna or if the K3's atu is sufficient?  Also the instructions call
for a 1:4 unun.  Can anyone point me a description of how to build
one?  And finally, if anyone has used an S9 with a K3, what has been
your experience?

Thanks and 73,

Tom
W8TJK