[Elecraft] [K1] KAT1 with EFHW?

[Curt]

I am planning a trip to "bush" in Ontario this spring, contemplating 
bringing my K1 which has a KAT1.  Last year used a different transmitter, a 
simple EFHW tuner, 34' wire on 20M ( and surprisingly on 30M ) with good 
success.  With little experience using the KAT1, from the manual it seems it 
isn't capable of dealing with high impedance of an EFHW.  Has anyone used 
the KAT1 with this type antenna with good results?  Does anyone know the 
maximum impedance the KAT1 can deal with?