Kent, There is some good software out there written by Reg Edwards that can calculate radiated power: http://www.zerobeat.net/G4FGQ/page3.html#S301%22 Look at TANT136 TOPHAT2 for example. -- 73 Warren K2ORS WD2XGJ 136-140kHz WD2XSH/23 505-510kHz WE2XEB/2 160-189kHz WE2XGR/1 505-515kHz FN42hi http://www.w4dex.com/wd2xgj.htm