[Elecraft] K4HD question

[Gary Smith]

At this time there are no nearby hams to 
disrupt my K3s. There are no local AM 
broadcasters that come in as overload. I 
do have issues with a few 2nd harmonic 
stations from the BC band, one for example 
from S. America on 1.8400. I won't likely 
be using my K4 at a contest site and I am 
the only ham in the house.

With that, is there anything the K4HD 
offers me Rx-wise, or otherwise, that the 
K4D does not?

Thanks,

Gary
KA1J