Sorry. Coming in late and haven't read all the response. FWIW: Resonance is when the impedance is purely resistive with no reactive component. That resistance can be anything but often falls in the range of a few Ohms to a few thousand Ohms. A resonant condition will provide a 1:1 SWR at 50 ohms only when the resistance is 50 ohms, which it almost never is. Most all antennas require some form of matching to get to 50 Ohms.
Lou W7HV