No need Art. PI*D*T=L 3.14159 * Diameter * #Turns of coax = total Length Mike VE9AA ---- I have the tools to measure its performance. I'll do that before I seriously consider putting it into service. I'd have to decoil it to get a length measurement as well. But at present I don't have an application for it. -- Art Greenberg WA2LLN art at artg.tv