For a power source, I plan to connect my rig to a 12V deep-cycle marine battery. My station will be on the second floor of a condo with antennas in the attic. I don't think I'll need to ground the rig. But if I do tie the chassis to the green wire ground of the closest electrical socket, I'm afraid it will cause undesirable effects with the antenna system since the electrical wiring also goes up into the attic. Any thoughts?