DX Engineering just put a nice little utility on their website to calculate loads on a tower mast. It's pretty handy when trying to figure out what antennas a mast pipe can handle. http://www.dxengineering.com/mastloadestimator?ibanner=DXEHPB1401001 73, Tim -- Tim Jellison W3YQ/KL7WV KL7WV Tower Service 304 704 1196 kl7wv at kl7wv.com www.kl7wv.com