Rick, Simpler and cheaper than mu metal is to put the K2 in a chassis box of steel. A metal shop should be able to replicate the K2 case in steel for you; but the cheap and simple solution is put the Astron supply on the floor under the operating desk, or on a low shelf under the desk. We do that with 3 Astron supplies at our club station and bring up power leads behind the desk. 73, Stuart K5KVH