I have 150 feet of 15 year-old Rg-214 still up. I measured the power in at 50W and the power out (at the other end) at 36.6W using a dummy load terminator of 50 ohms. As it still good or should I change it? I would be interested in the calcs. I already did mine but want to be sure. Thank you.?? Geoff, K6TFZ