Buck, K4IA wrote:
"If the line is 450 ohm and the antenna is 2 ohm or 20 ohm or 2000 ohm,
there is not resonance."

A resonant dipole has a drivepoint impedance that varies from near zero
ohms at zero elevation above the earth to about 100 ohms at 0.3
wavelength above the earth. For harmonic resonances, the radiation
resistances and the drivepoint resistances are higher than at the first
(1/2-wave) resonance.

The antenna may be devoid of reactance (resonant) and have divergent
drivepoint resistances depending upon which resonance, 1st, 2nd, 3rd,
etc, and placement of the antenna with respect to its surroundings.
Resonance and impedance matching are two different things.

Best regards, Richard Harrison, KB5WZI