To the left of the desk and the monitors is a coaxial patch field. The upper row has a cable to each rig, the lower to each antenna. This allows an "Any-To-Any" connection capability (I get that from the Day Job). All Coax runs have at least 1 Alpha Delta TT3G50 TransiTrap inline and well grounded. Tower runs have 2. One at the top of the tower and the other at the bottom of the tower.  There's a lot of good (and bad) info on the internet about shack grounding.  I'd rather err on the side of caution.  In my opinion, the documents in the PolyPhaser Knowledge Base are worth a read.  Find them here.