I saw this reference in QST this month on a grounding manual by Motorola. It is 500 pages plus if you want to know something about grounding. http://www.ronet.co.za/downloads/R56%20Guidelines.pdf Polyphaser also has a grounding manual on line and I may have sent this link before. http://www.radio2way.net/Polyphaser%20Guide.pdf 73 Mike K4PI