[Elecraft] KX-1 build complete, 20m reception problems

[Steven Reed]

I just finished the construction of my KX-1, including the 30/80 meter
module and the antenna tuner.  The rig works fantastic except for one
problem:  the reception on 20 meters is notably attenuated.  All the other
bands scream.  When I switch to 20 meters, the receive sensitivity seems
to drop by at least half!

Suggestions, anyone?

Thanks,

Steve, WB4EZM