Where can I read about this? Or is this by your own measurements? 73 Jim SM2EKM --------------------------------------------- Bill Wall wrote: >50%. Put 1000 watts on the Quad and you have apprx. 900 watts. Put 1000 >watts on the same Yagi and you have aprrx 500 watts out. The power is lost >in resistive heat. > Bill Wall KC4UZ Antenna Mart > > >