I have a 27m (90 ft) top loaded vertical on 160 that is also resonant as a voltage fed antenna at 3650. I match it on 80 with a 10 uH series inductor and 120 pF shunt capacitor. Note that the base is insulated from ground. This is very simple to get working. Rick Karlquist N6RK richard@karlquist.com www.n6rk.com www.karlquist.com