JA Using the old two clip lead in the window trick from 137 kHz...WOLF had to chew on it a bit longer at 500 kHz than on 137kHz. Groundwave may not be as good as expected but you're running WOLF20 so it's not a fair comparison. Note no sign of signal in waterfall... http://www.w1vd.com/XGR3_120107.gif Jay