Base loading is the MOST inefficient method of antenna loading. Yes, the antenna may well be resonant, but the current carrying portion of the antenna is confined with-in the coil. This is (one) of the draw-backs of the Yaesu ATAS series of HF mobile antennas. They're base-loaded. 73! Ken Kopp - K0PP k0pp at arrl.net or k0pp at ixpres.com