I'm in a limited space location, I'm looking for a wire antenna to use on 40-10 meters. The handbook says a 40m dipole fed with ladder line will be 2 half waves in phase on 20, and have 1.8 db gain. My coax fed 20m dipole is 10db better than my coax fed 40m dipole on 20, will open wire feeders and a tuner really improve it that much?de Dick NY1E