Here's another calculator which takes feedline loss into consideration: <http://www.antennas.ca/calc_ERP.htm> 73 Glenn AA5PK > On Jun 6, 2014, at 5:10 PM, Paul Stoetzer <n8hm at arrl.net> wrote: > If you wish to calculate your ERP, > please consult this page: http://www.csgnetwork.com/antennaecalc.html